1 | #!/bin/bash |
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2 | |
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3 | # |
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4 | # template script for generating fedora container for LXC |
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5 | # |
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6 | |
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7 | # |
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8 | # lxc: linux Container library |
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9 | |
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10 | # Authors: |
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11 | # Daniel Lezcano <daniel.lezcano@free.fr> |
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12 | # Ramez Hanna <rhanna@informatiq.org> |
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13 | |
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14 | # This library is free software; you can redistribute it and/or |
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15 | # modify it under the terms of the GNU Lesser General Public |
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16 | # License as published by the Free Software Foundation; either |
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17 | # version 2.1 of the License, or (at your option) any later version. |
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18 | |
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19 | # This library is distributed in the hope that it will be useful, |
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20 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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21 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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22 | # Lesser General Public License for more details. |
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23 | |
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24 | # You should have received a copy of the GNU Lesser General Public |
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25 | # License along with this library; if not, write to the Free Software |
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26 | # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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27 | |
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28 | #Configurations |
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29 | arch=$(arch) |
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30 | cache_base=/var/cache/lxc/fedora/$arch |
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31 | default_path=/var/lib/lxc |
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32 | root_password=root |
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33 | |
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34 | # is this fedora? |
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35 | [ -f /etc/fedora-release ] && is_fedora=true |
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36 | |
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37 | if [ "$arch" = "i686" ]; then |
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38 | arch=i386 |
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39 | fi |
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40 | |
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41 | configure_fedora() |
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42 | { |
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43 | |
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44 | # disable selinux in fedora |
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45 | mkdir -p $rootfs_path/selinux |
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46 | echo 0 > $rootfs_path/selinux/enforce |
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47 | |
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48 | # configure the network using the dhcp |
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49 | cat <<EOF > ${rootfs_path}/etc/sysconfig/network-scripts/ifcfg-eth0 |
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50 | DEVICE=eth0 |
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51 | BOOTPROTO=dhcp |
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52 | ONBOOT=yes |
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53 | HOSTNAME=${name} |
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54 | NM_CONTROLLED=no |
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55 | TYPE=Ethernet |
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56 | MTU=${MTU} |
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57 | EOF |
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58 | |
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59 | # set the hostname |
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60 | cat <<EOF > ${rootfs_path}/etc/sysconfig/network |
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61 | NETWORKING=yes |
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62 | HOSTNAME=${name} |
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63 | EOF |
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64 | |
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65 | # set minimal hosts |
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66 | cat <<EOF > $rootfs_path/etc/hosts |
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67 | 127.0.0.1 localhost $name |
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68 | EOF |
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69 | |
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70 | sed -i 's|.sbin.start_udev||' ${rootfs_path}/etc/rc.sysinit |
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71 | sed -i 's|.sbin.start_udev||' ${rootfs_path}/etc/rc.d/rc.sysinit |
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72 | # don't mount devpts, for pete's sake |
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73 | sed -i 's/^.*dev.pts.*$/#\0/' ${rootfs_path}/etc/rc.sysinit |
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74 | sed -i 's/^.*dev.pts.*$/#\0/' ${rootfs_path}/etc/rc.d/rc.sysinit |
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75 | |
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76 | chroot ${rootfs_path} chkconfig udev-post off |
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77 | chroot ${rootfs_path} chkconfig network on |
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78 | |
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79 | dev_path="${rootfs_path}/dev" |
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80 | rm -rf $dev_path |
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81 | mkdir -p $dev_path |
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82 | mknod -m 666 ${dev_path}/null c 1 3 |
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83 | mknod -m 666 ${dev_path}/zero c 1 5 |
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84 | mknod -m 666 ${dev_path}/random c 1 8 |
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85 | mknod -m 666 ${dev_path}/urandom c 1 9 |
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86 | mkdir -m 755 ${dev_path}/pts |
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87 | mkdir -m 1777 ${dev_path}/shm |
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88 | mknod -m 666 ${dev_path}/tty c 5 0 |
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89 | mknod -m 666 ${dev_path}/tty0 c 4 0 |
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90 | mknod -m 666 ${dev_path}/tty1 c 4 1 |
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91 | mknod -m 666 ${dev_path}/tty2 c 4 2 |
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92 | mknod -m 666 ${dev_path}/tty3 c 4 3 |
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93 | mknod -m 666 ${dev_path}/tty4 c 4 4 |
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94 | mknod -m 600 ${dev_path}/console c 5 1 |
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95 | mknod -m 666 ${dev_path}/full c 1 7 |
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96 | mknod -m 600 ${dev_path}/initctl p |
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97 | mknod -m 666 ${dev_path}/ptmx c 5 2 |
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98 | |
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99 | echo "setting root passwd to $root_password" |
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100 | echo "root:$root_password" | chroot $rootfs_path chpasswd |
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101 | |
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102 | # specifying this in the initial packages doesn't always work. |
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103 | echo "installing fedora-release package" |
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104 | chroot ${rootfs_path} yum --releasever=${release} -y install fedora-release |
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105 | |
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106 | # silence some needless startup errors |
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107 | touch ${rootfs_path}/etc/fstab |
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108 | |
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109 | # give us a console on /dev/console |
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110 | sed -i 's/ACTIVE_CONSOLES=.*$/ACTIVE_CONSOLES="\/dev\/console \/dev\/tty[1-4]"/' \ |
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111 | ${rootfs_path}/etc/sysconfig/init |
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112 | |
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113 | return 0 |
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114 | } |
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115 | |
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116 | download_fedora() |
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117 | { |
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118 | |
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119 | # check the mini fedora was not already downloaded |
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120 | INSTALL_ROOT=$cache/partial |
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121 | mkdir -p $INSTALL_ROOT |
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122 | if [ $? -ne 0 ]; then |
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123 | echo "Failed to create '$INSTALL_ROOT' directory" |
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124 | return 1 |
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125 | fi |
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126 | |
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127 | # download a mini fedora into a cache |
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128 | echo "Downloading fedora minimal ..." |
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129 | YUM="yum --installroot $INSTALL_ROOT -y --nogpgcheck" |
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130 | PKG_LIST="yum initscripts passwd rsyslog vim-minimal dhclient chkconfig rootfiles policycoreutils fedora-release" |
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131 | MIRRORLIST_URL="http://mirrors.fedoraproject.org/mirrorlist?repo=fedora-$release&arch=$arch" |
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132 | |
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133 | DOWNLOAD_OK=no |
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134 | for trynumber in 1 2 3; do |
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135 | [ $trynumber != 1 ] && echo "Trying again..." |
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136 | MIRROR_URL=$(curl -s -S -f "$MIRRORLIST_URL" | head -n2 | tail -n1) |
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137 | if [ $? -ne 0 ] || [ -z "$MIRROR_URL" ]; then |
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138 | echo "Failed to get a mirror" |
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139 | continue |
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140 | fi |
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141 | RELEASE_URL="$MIRROR_URL/Packages/fedora-release-$release-1.noarch.rpm" |
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142 | echo "Fetching from $RELEASE_URL" |
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143 | curl -f "$RELEASE_URL" > $INSTALL_ROOT/fedora-release-$release.noarch.rpm |
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144 | if [ $? -ne 0 ]; then |
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145 | echo "Failed to download fedora release rpm" |
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146 | continue |
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147 | fi |
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148 | DOWNLOAD_OK=yes |
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149 | break |
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150 | done |
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151 | if [ $DOWNLOAD_OK != yes ]; then |
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152 | echo "Aborting" |
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153 | return 1 |
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154 | fi |
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155 | |
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156 | mkdir -p $INSTALL_ROOT/var/lib/rpm |
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157 | rpm --root $INSTALL_ROOT --initdb |
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158 | rpm --root $INSTALL_ROOT -ivh $INSTALL_ROOT/fedora-release-$release.noarch.rpm |
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159 | $YUM install $PKG_LIST |
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160 | |
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161 | if [ $? -ne 0 ]; then |
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162 | echo "Failed to download the rootfs, aborting." |
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163 | return 1 |
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164 | fi |
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165 | |
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166 | mv "$INSTALL_ROOT" "$cache/rootfs" |
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167 | echo "Download complete." |
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168 | |
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169 | return 0 |
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170 | } |
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171 | |
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172 | copy_fedora() |
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173 | { |
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174 | |
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175 | # make a local copy of the minifedora |
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176 | echo -n "Copying rootfs to $rootfs_path ..." |
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177 | #cp -a $cache/rootfs-$arch $rootfs_path || return 1 |
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178 | # i prefer rsync (no reason really) |
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179 | mkdir -p $rootfs_path |
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180 | rsync -a $cache/rootfs/ $rootfs_path/ |
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181 | return 0 |
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182 | } |
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183 | |
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184 | update_fedora() |
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185 | { |
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186 | chroot $cache/rootfs yum -y update |
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187 | } |
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188 | |
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189 | install_fedora() |
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190 | { |
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191 | mkdir -p /var/lock/subsys/ |
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192 | ( |
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193 | flock -x 200 |
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194 | if [ $? -ne 0 ]; then |
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195 | echo "Cache repository is busy." |
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196 | return 1 |
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197 | fi |
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198 | |
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199 | echo "Checking cache download in $cache/rootfs ... " |
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200 | if [ ! -e "$cache/rootfs" ]; then |
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201 | download_fedora |
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202 | if [ $? -ne 0 ]; then |
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203 | echo "Failed to download 'fedora base'" |
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204 | return 1 |
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205 | fi |
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206 | else |
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207 | echo "Cache found. Updating..." |
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208 | update_fedora |
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209 | if [ $? -ne 0 ]; then |
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210 | echo "Failed to update 'fedora base', continuing with last known good cache" |
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211 | else |
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212 | echo "Update finished" |
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213 | fi |
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214 | fi |
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215 | |
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216 | echo "Copy $cache/rootfs to $rootfs_path ... " |
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217 | copy_fedora |
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218 | if [ $? -ne 0 ]; then |
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219 | echo "Failed to copy rootfs" |
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220 | return 1 |
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221 | fi |
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222 | |
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223 | return 0 |
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224 | |
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225 | ) 200>/var/lock/subsys/lxc |
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226 | |
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227 | return $? |
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228 | } |
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229 | |
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230 | copy_configuration() |
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231 | { |
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232 | |
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233 | mkdir -p $config_path |
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234 | cat <<EOF >> $config_path/config |
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235 | lxc.utsname = $name |
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236 | lxc.tty = 4 |
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237 | lxc.pts = 1024 |
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238 | lxc.rootfs = $rootfs_path |
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239 | lxc.mount = $config_path/fstab |
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240 | |
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241 | # uncomment the next line to run the container unconfined: |
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242 | #lxc.aa_profile = unconfined |
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243 | |
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244 | #cgroups |
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245 | lxc.cgroup.devices.deny = a |
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246 | # /dev/null and zero |
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247 | lxc.cgroup.devices.allow = c 1:3 rwm |
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248 | lxc.cgroup.devices.allow = c 1:5 rwm |
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249 | # consoles |
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250 | lxc.cgroup.devices.allow = c 5:1 rwm |
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251 | lxc.cgroup.devices.allow = c 5:0 rwm |
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252 | lxc.cgroup.devices.allow = c 4:0 rwm |
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253 | lxc.cgroup.devices.allow = c 4:1 rwm |
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254 | # /dev/{,u}random |
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255 | lxc.cgroup.devices.allow = c 1:9 rwm |
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256 | lxc.cgroup.devices.allow = c 1:8 rwm |
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257 | lxc.cgroup.devices.allow = c 136:* rwm |
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258 | lxc.cgroup.devices.allow = c 5:2 rwm |
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259 | # rtc |
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260 | lxc.cgroup.devices.allow = c 254:0 rwm |
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261 | EOF |
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262 | |
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263 | cat <<EOF > $config_path/fstab |
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264 | proc proc proc nodev,noexec,nosuid 0 0 |
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265 | sysfs sys sysfs defaults 0 0 |
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266 | EOF |
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267 | if [ $? -ne 0 ]; then |
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268 | echo "Failed to add configuration" |
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269 | return 1 |
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270 | fi |
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271 | |
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272 | return 0 |
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273 | } |
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274 | |
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275 | clean() |
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276 | { |
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277 | |
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278 | if [ ! -e $cache ]; then |
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279 | exit 0 |
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280 | fi |
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281 | |
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282 | # lock, so we won't purge while someone is creating a repository |
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283 | ( |
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284 | flock -x 200 |
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285 | if [ $? != 0 ]; then |
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286 | echo "Cache repository is busy." |
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287 | exit 1 |
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288 | fi |
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289 | |
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290 | echo -n "Purging the download cache for Fedora-$release..." |
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291 | rm --preserve-root --one-file-system -rf $cache && echo "Done." || exit 1 |
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292 | exit 0 |
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293 | |
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294 | ) 200>/var/lock/subsys/lxc |
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295 | } |
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296 | |
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297 | usage() |
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298 | { |
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299 | cat <<EOF |
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300 | usage: |
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301 | $1 -n|--name=<container_name> |
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302 | [-p|--path=<path>] [-c|--clean] [-R|--release=<Fedora_release>] [-A|--arch=<arch of the container>] |
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303 | [-h|--help] |
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304 | Mandatory args: |
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305 | -n,--name container name, used to as an identifier for that container from now on |
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306 | Optional args: |
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307 | -p,--path path to where the container rootfs will be created, defaults to /var/lib/lxc. The container config will go under /var/lib/lxc in that case |
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308 | -c,--clean clean the cache |
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309 | -R,--release Fedora release for the new container. if the host is Fedora, then it will defaultto the host's release. |
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310 | -A,--arch NOT USED YET. Define what arch the container will be [i686,x86_64] |
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311 | -h,--help print this help |
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312 | EOF |
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313 | return 0 |
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314 | } |
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315 | |
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316 | options=$(getopt -o hp:n:cR: -l help,path:,name:,clean,release: -- "$@") |
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317 | if [ $? -ne 0 ]; then |
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318 | usage $(basename $0) |
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319 | exit 1 |
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320 | fi |
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321 | eval set -- "$options" |
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322 | |
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323 | while true |
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324 | do |
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325 | case "$1" in |
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326 | -h|--help) usage $0 && exit 0;; |
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327 | -p|--path) path=$2; shift 2;; |
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328 | -n|--name) name=$2; shift 2;; |
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329 | -c|--clean) clean=$2; shift 2;; |
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330 | -R|--release) release=$2; shift 2;; |
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331 | --) shift 1; break ;; |
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332 | *) break ;; |
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333 | esac |
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334 | done |
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335 | |
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336 | if [ ! -z "$clean" -a -z "$path" ]; then |
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337 | clean || exit 1 |
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338 | exit 0 |
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339 | fi |
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340 | |
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341 | needed_pkgs="" |
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342 | type yum >/dev/null 2>&1 |
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343 | if [ $? -ne 0 ]; then |
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344 | needed_pkgs="yum $needed_pkgs" |
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345 | fi |
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346 | |
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347 | type curl >/dev/null 2>&1 |
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348 | if [ $? -ne 0 ]; then |
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349 | needed_pkgs="curl $needed_pkgs" |
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350 | fi |
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351 | |
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352 | if [ -n "$needed_pkgs" ]; then |
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353 | echo "Missing commands: $needed_pkgs" |
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354 | echo "Please install these using \"sudo apt-get install $needed_pkgs\"" |
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355 | exit 1 |
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356 | fi |
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357 | |
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358 | if [ -z "$path" ]; then |
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359 | path=$default_path |
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360 | fi |
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361 | |
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362 | if [ -z "$release" ]; then |
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363 | if [ "$is_fedora" ]; then |
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364 | release=$(cat /etc/fedora-release |awk '/^Fedora/ {print $3}') |
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365 | else |
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366 | echo "This is not a fedora host and release missing, defaulting to 14. use -R|--release to specify release" |
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367 | release=14 |
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368 | fi |
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369 | fi |
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370 | |
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371 | if [ "$(id -u)" != "0" ]; then |
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372 | echo "This script should be run as 'root'" |
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373 | exit 1 |
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374 | fi |
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375 | |
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376 | |
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377 | rootfs_path=$path/rootfs |
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378 | config_path=$default_path/$name |
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379 | cache=$cache_base/$release |
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380 | |
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381 | revert() |
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382 | { |
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383 | echo "Interrupted, so cleaning up" |
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384 | lxc-destroy -n $name |
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385 | # maybe was interrupted before copy config |
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386 | rm -rf $path/$name |
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387 | rm -rf $default_path/$name |
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388 | echo "exiting..." |
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389 | exit 1 |
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390 | } |
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391 | |
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392 | trap revert SIGHUP SIGINT SIGTERM |
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393 | |
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394 | copy_configuration |
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395 | if [ $? -ne 0 ]; then |
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396 | echo "failed write configuration file" |
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397 | exit 1 |
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398 | fi |
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399 | |
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400 | install_fedora |
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401 | if [ $? -ne 0 ]; then |
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402 | echo "failed to install fedora" |
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403 | exit 1 |
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404 | fi |
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405 | |
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406 | configure_fedora |
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407 | if [ $? -ne 0 ]; then |
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408 | echo "failed to configure fedora for a container" |
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409 | exit 1 |
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410 | fi |
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411 | |
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412 | |
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413 | if [ ! -z $clean ]; then |
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414 | clean || exit 1 |
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415 | exit 0 |
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416 | fi |
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417 | echo "container rootfs and config created" |
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