[[PageOutline]] * [http://unix.stackexchange.com/questions/71527/arch-linux-pacman-does-not-work-when-chrooting grub2 - Arch linux : pacman does not work when chrooting - Unix & Linux Stack Exchange] > Remember to {{{arch-chroot}}} and not simply {{{chroot}}} - that way {{{/proc}}} will be populated and pacman will function as expected. * [http://bryanalves.github.io/2015/07/02/enabling-lxc-archlinux-with-systemd-networkd/ Enabling LXC on Archlinux with systemd-networkd – Bryan's Blah Blog] > I’m on a laptop with wireless, so I can’t just create a bridge and give IPs to containers from an upstream DHCP server. I needed to do NAT and essentially simulate/replicate how docker networking works. = DHCP = == no valid interfaces found == * Arch Linux 4.4.5-1 * lxc 1:1.1.5-4 * dhcpcd 6.10.1-1 * # dhcpcd {{{ dev: loaded udev no valid interfaces found no interfaces have a carrier forked to background, child pid 65 }}} * # dhcpcd eth0 {{{ DUID 00:01:00:01:1e:8a:6a:5e:ba:4a:37:94:4a:9d eth0: IAID 16:b6:47:44 eth0: rebinding lease of 192.168.0.185 eth0: NAK: address in use from 192.168.0.1 eth0: message: address in use eth0: soliciting a DHCP lease eth0: soliciting an IPv6 router eth0: offered 192.168.0.172 from 192.168.0.1 eth0: probing address 192.168.0.172/24 eth0: leased 192.168.0.172 for 86400 seconds eth0: adding route to 192.168.0.0/24 eth0: adding default route via 192.168.0.1 forked to background, child pid 123 }}} * LXCコンテナ内で、udevdが起動しないことが原因の模様 * strace -f dhcpcd * コンテナホスト(検証はKVMゲストで行った) {{{ access("/run/udev/control", F_OK) = 0 open("/sys/devices/virtual/net/lo/uevent", O_RDONLY|O_CLOEXEC) = 9 fstat(9, {st_mode=S_IFREG|0644, st_size=4096, ...}) = 0 fstat(9, {st_mode=S_IFREG|0644, st_size=4096, ...}) = 0 read(9, "INTERFACE=lo\nIFINDEX=1\n", 4096) = 23 read(9, "", 4096) = 0 read(9, "", 4096) = 0 close(9) = 0 open("/run/udev/data/n1", O_RDONLY|O_CLOEXEC) = 9 open("/sys/devices/pci0000:00/0000:00:03.0/virtio0/net/ens3/uevent", O_RDONLY|O_CLOEXEC) = 9 fstat(9, {st_mode=S_IFREG|0644, st_size=4096, ...}) = 0 fstat(9, {st_mode=S_IFREG|0644, st_size=4096, ...}) = 0 read(9, "INTERFACE=ens3\nIFINDEX=2\n", 4096) = 25 read(9, "", 4096) = 0 read(9, "", 4096) = 0 close(9) = 0 open("/run/udev/data/n2", O_RDONLY|O_CLOEXEC) = 9 }}} * LXCコンテナ {{{ access("/run/udev/control", F_OK) = -1 ENOENT (No such file or directory) open("/sys/devices/virtual/net/lo/uevent", O_RDONLY|O_CLOEXEC) = 9 fstat(9, {st_mode=S_IFREG|0644, st_size=4096, ...}) = 0 fstat(9, {st_mode=S_IFREG|0644, st_size=4096, ...}) = 0 read(9, "INTERFACE=lo\nIFINDEX=1\n", 4096) = 23 read(9, "", 4096) = 0 read(9, "", 4096) = 0 close(9) = 0 open("/run/udev/data/n1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) open("/sys/devices/virtual/net/eth0/uevent", O_RDONLY|O_CLOEXEC) = 9 fstat(9, {st_mode=S_IFREG|0644, st_size=4096, ...}) = 0 fstat(9, {st_mode=S_IFREG|0644, st_size=4096, ...}) = 0 read(9, "INTERFACE=eth0\nIFINDEX=6\n", 4096) = 25 read(9, "", 4096) = 0 read(9, "", 4096) = 0 close(9) = 0 open("/run/udev/data/n6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) write(2, "no valid interfaces found", 25) = 25 write(2, "\n", 1) = 1 write(1, "no interfaces have a carrier\n", 29) = 29 }}} * [root@test /]# systemctl status systemd-udevd {{{ ● systemd-udevd.service - udev Kernel Device Manager Loaded: loaded (/usr/lib/systemd/system/systemd-udevd.service; static; vendor preset: disabled) Active: inactive (dead) Condition: start condition failed at Sat 2016-04-02 08:30:59 UTC; 5h 9min ago ConditionPathIsReadWrite=/sys was not met Docs: man:systemd-udevd.service(8) man:udev(7) }}} * arch:Linux_Containers#Systemd_considerations_.28required.29 * 上記を参考にsystemdの設定を行ったが効果なし * arch:dhcpcd#dhcpcd_and_systemd_network_interfaces > {{{dhcpcd.service}}} can be [arch:Enabled] without specifying an interface. This may, however, create a race condition at boot with ''systemd-udevd'' trying to apply a predictable network interface name: > {{{ > error changing net interface name wlan0 to wlp4s0: Device or resource busy" > }}} > To avoid it, enable dhcpcd per interface it should bind to as described in [arch:dhcpcd#Running]. The downside of the template unit is, however, that it does not support hot-plugging of a wired connection and will fail if the network cable is not connected. To work-around the failure, see [arch:dhcpcd#Timeout_delay]. とのことなので、いずれにせよ{{{dhcpcd.service}}}を使用しないのがよさそう * 古い情報 * [http://blog.oddbit.com/2013/02/01/dhcpcd-under-lxc/ Odd Bits] {{{dhcpcd[492]: eth0: if_init: Read-only file system}}} == Dependency failed for dhcpcd on eth0. == * # systemctl start dhcpcd@eth0 {{{ A dependency job for dhcpcd@eth0.service failed. See 'journalctl -xe' for details. }}} * # journalctl -xe {{{ Apr 10 20:00:56 test3 systemd[1]: Starting of sys-subsystem-net-devices-eth0.device not supported. -- Subject: Unit sys-subsystem-net-devices-eth0.device has failed -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit sys-subsystem-net-devices-eth0.device has failed. -- -- The result is unsupported. Apr 10 20:00:56 test3 systemd[1]: Dependency failed for dhcpcd on eth0. -- Subject: Unit dhcpcd@eth0.service has failed -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit dhcpcd@eth0.service has failed. -- -- The result is dependency. Apr 10 20:00:56 test3 systemd[1]: dhcpcd@eth0.service: Job dhcpcd@eth0.service/start failed with result 'dependency'. }}} * /usr/lib/systemd/system/dhcpcd@.service {{{ [Unit] Description=dhcpcd on %I Wants=network.target Before=network.target BindsTo=sys-subsystem-net-devices-%i.device After=sys-subsystem-net-devices-%i.device [Service] Type=forking PIDFile=/run/dhcpcd-%I.pid ExecStart=/usr/bin/dhcpcd -q -w %I ExecStop=/usr/bin/dhcpcd -x %I [Install] WantedBy=multi-user.target }}} * {{{BindsTo=}}}, {{{After=}}}の行を削除することで対応可能 * see also * [https://bbs.archlinux.org/viewtopic.php?id=164753 Netctl doesn't work in LXC (Linux containers) due to udev dependency / Networking, Server, and Protection / Arch Linux Forums] * [https://bugs.archlinux.org/task/35715 FS#35715 : (netctl) fails to start network inside Linux Container]