Changes between Version 55 and Version 56 of TipAndDoc/Linux/LXC

Timestamp:

Apr 23, 2016 4:39:18 PM (8 years ago)

Author:

mitty

Comment:

--

TipAndDoc/Linux/LXC

@@ -1 +1 @@
 [[PageOutline]]
+[[TitleIndex(TipAndDoc/Linux/LXC,format=group)]]
 
  * LinuX Container
@@ -122 +123 @@
  > > No, this is a non-fatal error, so you're just fine.
 
- * [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.
-
  = two NICs in one container =
  * [http://www.mail-archive.com/lxc-users@lists.sourceforge.net/msg02037.html Re: (Lxc-users) two NICs in container]
@@ -307 +302 @@
   * [http://blog.xe.bz/archives/51645042.html AKIBA de: (メモ) tarの--numeric-ownerオプションはどう働くのか？]
 
- = 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]