wiki:TipAndDoc/Linux/LXC/ArchLinux

  1. lxc.service
    1. A stop job is running
      1. コンテナのシャットダウンについて
    2. systemctl enable lxc.service
  2. dhcpcd.service
    1. no valid interfaces found
    2. Dependency failed for dhcpcd on eth0.

lxc.service

A stop job is running

  • lxc.serviceを有効にしないと、ホストOSシャットダウン時にコンテナが自動シャットダウンされず90秒タイムアウト待ちが発生する
  • mitty@lxc-host:~$ journalctl 
    Apr 17 22:52:41 lxc-host sudo[1908]:    mitty : TTY=pts/0 ; PWD=/home/mitty ; USER=root ; COMMAND=/usr/bin/sh -c poweroff

(snip)

Apr 17 22:52:41 lxc-host systemd[529]: Received SIGRTMIN+24 from PID 1913 (kill).
Apr 17 22:52:41 lxc-host systemd[1]: Stopped User Manager for UID 1000.
Apr 17 22:52:42 lxc-host systemd[1]: Started Generate shutdown-ramfs.
Apr 17 22:54:11 lxc-host systemd[1]: session-c1.scope: Stopping timed out. Killing.
Apr 17 22:54:11 lxc-host systemd[1]: Stopped Session c1 of user mitty.
  • mitty@test:~$ journalctl 
    Apr 17 22:52:41 test systemd[1]: Received SIGHUP.
Apr 17 22:52:41 test systemd[1]: Received SIGTERM.
Apr 17 22:52:41 test systemd[1]: Reexecuting.
Apr 17 22:52:41 test systemd[1]: systemd 229 running in system mode. (+PAM -AUDIT -SELINUX -IMA -APPARMOR +SMACK -SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD +IDN)
Apr 17 22:52:41 test systemd[1]: Detected virtualization lxc.
Apr 17 22:52:41 test systemd[1]: Detected architecture x86-64.
Apr 17 22:52:41 test systemd[1]: Failed to install release agent, ignoring: No such file or directory

コンテナのシャットダウンについて

  • man systemd 
    SIGNALS
       SIGTERM
           Upon receiving this signal the systemd system manager serializes
           its state, reexecutes itself and deserializes the saved state
           again. This is mostly equivalent to systemctl daemon-reexec.

           systemd user managers will start the exit.target unit when this
           signal is received. This is mostly equivalent to systemctl --user
           start exit.target.

(snip)

       SIGHUP
           Reloads the complete daemon configuration. This is mostly
           equivalent to systemctl daemon-reload.

(snip)

       SIGRTMIN+4
           Powers off the machine, starts the poweroff.target unit. This is
           mostly equivalent to systemctl start poweroff.target.

(snip)

       SIGRTMIN+14
           Immediately powers off the machine.
  • lxc-stop
    • Host 
      Apr 19 22:15:54 lxc-host sudo[589]:    mitty : TTY=pts/0 ; PWD=/home/mitty ; USER=root ; COMMAND=/usr/bin/lxc-stop -n test
    • container 
      Apr 19 22:15:54 test systemd[1]: Received SIGRTMIN+4.
Apr 19 22:15:54 test systemd[1]: Stopping User Manager for UID 1000...
Apr 19 22:15:54 test systemd[1]: Stopped target Multi-User System.

systemctl enable lxc.service

  • /usr/lib/systemd/system/lxc.service 
    ExecStart=/usr/lib/lxc/lxc-containers start
ExecStop=/usr/lib/lxc/lxc-containers stop
  • /usr/lib/lxc/lxc-containers 
    # STOPOPTS are stop options.  The can be used for anything else to stop.
#	If you want to kill containers fast, use -k
STOPOPTS="-a -A -s"

(snip)

case "$1" in

(snip)

    stop)

(snip)

        "$bindir"/lxc-autostart $STOPOPTS $SHUTDOWNDELAY
  • man lxc-autostart 
           -s,--shutdown
              Request  a  clean  shutdown. If a [-t timeout] greater than 0 is
              given and the container has not shut down within this period, it
              will be killed as with the [-k kill] option.

(snip)

       -a,--all
              Ignore lxc.group and select all auto-started containers.

       -A,--ignore-auto
              Ignore  the  lxc.start.auto  flag. Combined with -a, will select
              all containers on the system.
  • mitty@lxc-host:~$ sudo systemctl enable --now lxc.service 
    Created symlink from /etc/systemd/system/multi-user.target.wants/lxc.service to /usr/lib/systemd/system/lxc.service.
  • mitty@lxc-host:~$ journalctl 
    Apr 19 23:22:34 lxc-host sudo[573]:    mitty : TTY=pts/0 ; PWD=/home/mitty ; USER=root ; COMMAND=/usr/bin/sh -c poweroff

(snip)

Apr 19 23:22:34 lxc-host systemd[1]: Stopped LXC Container Initialization and Autoboot Code.
  • mitty@test:~$ journalctl 
    Apr 19 23:22:34 test systemd[1]: Received SIGTERM.
Apr 19 23:22:34 test systemd[1]: Reexecuting.
Apr 19 23:22:34 test systemd[1]: systemd 229 running in system mode. (+PAM -AUDIT -SELINUX -IMA -APPARMOR +SMACK -SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD +IDN)
Apr 19 23:22:34 test systemd[1]: Detected virtualization lxc.
Apr 19 23:22:34 test systemd[1]: Detected architecture x86-64.
Apr 19 23:22:34 test systemd[1]: Failed to install release agent, ignoring: No such file or directory
Apr 19 23:22:34 test systemd[1]: Received SIGHUP.
Apr 19 23:22:34 test systemd[1]: Received SIGRTMIN+4.
Apr 19 23:22:34 test systemd[1]: Reloading.
Apr 19 23:22:34 test systemd[1]: Stopped target Multi-User System.

(snip)

Apr 19 23:22:34 test systemd[1]: Shutting down.
Apr 19 23:22:34 test systemd-journald[13]: Journal stopped

dhcpcd.service

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 ​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 ​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 ​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
    • ​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
Last modified 9 years ago Last modified on Apr 23, 2016 5:24:06 PM

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