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Docker for Mac 4.18 で再び Failed to get D-Bus connection エラーが出たときの対処法

Last updated at Posted at 2023-04-08

結論

  • Dockerfile で /sys/fs/cgroup の Volume をマウント
  • docker-compose.yml で cgroup: host を設定

環境

Mac

  • OS: Mac OS X Monterey 12.6.3
  • チップ: Apple M1 Max
  • メモリ: 64GB

Docker

  • Docker Desktop for Mac 4.18.0
  • Base Docker Image: amazonlinux:2

systemctl が利用できない

Docker for Mac で開発していて 4.3 になった際に cgroup の扱いが V2 に変わり Apache が起動しない、systemctl が使えないと悩まされました。
実際に Docker にログインすると下記のエラーが出て systemctl を実行すると D-Bus の Connection が作成できないエラーが出ていました。

bash-4.2# systemctl status httpd
Failed to get D-Bus connection: No such file or directory

その時は下記記事で語られているように "deprecatedCgroupV1": true を設定することで systemctl が利用できるようになりました。
Docker for mac (ver 4.3以降) で「Failed to get D-Bus connection」エラーが出たときの対処法

しかしながら Docker for Mac 4.18 で "deprecatedCgroupV1": true を設定していても Failed to get D-Bus connection が出たのでその対処法を探しました。

Docker for Mac 4.18 での対処法

Dockerfile の変更

Docker Container の /sys/fs/cgroup を読み書き可能な Volume を Mount する

FROM amazonlinux:2

RUN (cd /lib/systemd/system/sysinit.target.wants/; for i in *; do [ $i == \
  systemd-tmpfiles-setup.service ] || rm -f $i; done); \
  rm -f /lib/systemd/system/multi-user.target.wants/*;\
  rm -f /etc/systemd/system/*.wants/*;\
  rm -f /lib/systemd/system/local-fs.target.wants/*; \
  rm -f /lib/systemd/system/sockets.target.wants/*udev*; \
  rm -f /lib/systemd/system/sockets.target.wants/*initctl*; \
  rm -f /lib/systemd/system/basic.target.wants/*;\
  rm -f /lib/systemd/system/anaconda.target.wants/*;
VOLUME [ "/sys/fs/cgroup" ]

こちらの記事を参考にしています。
M1 Mac centos:7 Failed to get D-Bus connection: No such file or directory

docker-compose.yml の変更

cgroup: host の設定を追加する

version: "3.3"
services:
  web:
    build: .
    ports:
      - 8080:80
      - 4430:443
    privileged: true
    platform: linux/x86_64
    cgroup: host # この行を追加

注意点

起動してすぐは D-Bus に接続することができないため Docker Container 起動後30秒(環境によると思います)ほど様子をみてください。

bash-4.2# while true; do systemctl status httpd; sleep 1; done 
Failed to get D-Bus connection: No such file or directory
Failed to get D-Bus connection: No such file or directory
Failed to get D-Bus connection: No such file or directory
Failed to get D-Bus connection: No such file or directory
Failed to get D-Bus connection: No such file or directory
Failed to get D-Bus connection: No such file or directory
Failed to get D-Bus connection: No such file or directory
Failed to get D-Bus connection: No such file or directory
Failed to get D-Bus connection: No such file or directory
Failed to get D-Bus connection: No such file or directory
Failed to get D-Bus connection: No such file or directory
Failed to get D-Bus connection: No such file or directory
Failed to get D-Bus connection: No such file or directory
Failed to get D-Bus connection: No such file or directory
Failed to get D-Bus connection: No such file or directory
Failed to get D-Bus connection: No such file or directory
Failed to get D-Bus connection: No such file or directory
● httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled)
   Active: inactive (dead)
     Docs: man:httpd.service(8)
● httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled)
   Active: inactive (dead)
     Docs: man:httpd.service(8)
● httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled)
   Active: active (running) since Sat 2023-04-08 20:00:20 JST; 843ms ago
     Docs: man:httpd.service(8)
 Main PID: 308 (httpd)
   Status: "Processing requests..."
   CGroup: /system.slice/httpd.service
           ├─308 /usr/bin/qemu-x86_64 /usr/sbin/httpd /usr/sbin/httpd -DFOREGROUND
           ├─315 /usr/bin/qemu-x86_64 /usr/sbin/httpd /usr/sbin/httpd -DFOREGROUND
           ├─317 /usr/bin/qemu-x86_64 /usr/sbin/httpd /usr/sbin/httpd -DFOREGROUND
           ├─319 /usr/bin/qemu-x86_64 /usr/sbin/httpd /usr/sbin/httpd -DFOREGROUND
           ├─321 /usr/bin/qemu-x86_64 /usr/sbin/httpd /usr/sbin/httpd -DFOREGROUND
           └─323 /usr/bin/qemu-x86_64 /usr/sbin/httpd /usr/sbin/httpd -DFOREGROUND
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