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Version 2 (modified by mitty, 8 years ago) (diff)
--

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
dhcpcd.service
1. no valid interfaces found
2. Dependency failed for dhcpcd on eth0.

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.

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.

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.

/usr/share/lxc/config/archlinux.common.conf

# Set the halt/stop signals
lxc.haltsignal=SIGRTMIN+4
lxc.stopsignal=SIGRTMIN+14

(lxc-devel) Shutting down containers properly
(Solved) LXC shutdown of archlinux containers not working (lxc-stop) / System Administration / Arch Linux Forums

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

see also
- Netctl doesn't work in LXC (Linux containers) due to udev dependency / Networking, Server, and Protection / Arch Linux Forums
- FS#35715 : (netctl) fails to start network inside Linux Container