wiki:TipAndDoc/Linux/LXC/ArchLinux

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 12 months ago Last modified on Apr 23, 2016 5:24:06 PM

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