LXC上のCentOS7起動が1時間かかるのでpull reqしといた

• [lxc-devel] [PATCH] Various fixes for Fedora/CentOS/OpenSUSE templates and systemd.を当ててLXCをビルドする

• lxc.cap.drop から setpcapを外せばよい。(fedora.common.confが参考になる。)

• pull requestした。

  • https://github.com/lxc/lxc/pull/342
  • https://github.com/lxc/lxc/pull/341

• issue報告

  • big big login delays in CentOS 7 systemd. · Issue #340 · lxc/lxc

lxc 1.0.6の場合

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

- lxc.cap.drop = mac_admin mac_override setfcap setpcap
+ lxc.cap.drop = mac_admin mac_override setfcap

lxc 1.1.0の場合

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

- lxc.cap.drop = setfcap setpcap sys_nice sys_pacct sys_rawio
+ lxc.cap.drop = setfcap sys_nice sys_pacct sys_rawio

• setpcapをコメントアウトしない場合
  • ネットワークが有効にならなかった。
  • また、systemctlコマンドもFailed to get D-Bus connection: Failed to authenticate in time.となった。
• 試しにこれでCentOS6も動かしてみたが動作はした。
  • CentOS7を動かすとlxc-stopがキッカリ1分かかるが、起動に1時間かかるよりかは良い。

構築手順: ArchLinuxでLXCを動かしてみた - Qiita

同現象

• [lxc-users] Centos-7 x86_64 container slow and buggy start
• build on centos7 container · Issue #68 · SolidCharity/LightBuildServer

$ sudo lxc-start -n centos7
systemd 208 running in system mode. (+PAM +LIBWRAP +AUDIT +SELINUX +IMA +SYSVINIT +LIBCRYPTSETUP +GCRYPT +ACL +XZ)
Detected virtualization 'lxc'.

Welcome to CentOS Linux 7 (Core)!

Cannot add dependency job for unit display-manager.service, ignoring: Unit display-manager.service failed to load: No such file or directory.
[  OK  ] Reached target Remote File Systems.
[  OK  ] Listening on /dev/initctl Compatibility Named Pipe.
[  OK  ] Listening on Delayed Shutdown Socket.
[  OK  ] Reached target Encrypted Volumes.
[  OK  ] Listening on Journal Socket.
         Mounting Debug File System...
         Mounting POSIX Message Queue File System...
         Mounting Huge Pages File System...
         Starting Journal Service...
[  OK  ] Started Journal Service.
         Mounting Configuration File System...
         Starting Create static device nodes in /dev...
[  OK  ] Reached target Swap.


         Starting Remount Root and Kernel File Systems...
[  OK  ] Created slice Root Slice.
[  OK  ] Created slice User and Session Slice.
[  OK  ] Created slice System Slice.
[  OK  ] Reached target Slices.
[  OK  ] Created slice system-getty.slice.
[  OK  ] Mounted Debug File System.

ここまでで20分・・・