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Docker에서 CAP_IPC_LOCK 및 CAP_SYS_NICE capability 설정

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질문

Docker에서 ClickHouse를 실행할 때 시스템에 CAP_IPC_LOCK 및 CAP_SYS_NICE capability가 없다고 Docker가 경고합니다. 이를 어떻게 해결할 수 있습니까?

다음은 CAP_SYS_NICE capability가 없을 때 표시되는 로그 메시지 예시입니다:

docker run -d --name clickhouse-server \
    --ulimit nofile=262144:262144 \
    --network clickhouse-net \
    -p 8123:8123 -p 9000:9000 -p 9009:9009 -p 9363:9363 \
    clickhouse/clickhouse-server:23.2
2023.04.19 08:04:10.022720 [ 1 ] {} <Information> Application: It looks like the process has no CAP_IPC_LOCK capability, binary mlock will be disabled. It could happen due to incorrect ClickHouse package installation. You could resolve the problem manually with 'sudo setcap cap_ipc_lock=+ep /usr/bin/clickhouse'. Note that it will not work on 'nosuid' mounted filesystems.

2023.04.19 08:04:10.065860 [ 1 ] {} <Information> Application: It looks like the process has no CAP_SYS_NICE capability, the setting 'os_thread_priority' will have no effect. It could happen due to incorrect ClickHouse package installation. You could resolve the problem manually with 'sudo setcap cap_sys_nice=+ep /usr/bin/clickhouse'. Note that it will not work on 'nosuid' mounted filesystems.

답변

  1. 컨테이너에 IPC_LOCK 및 SYS_NICE capability를 부여하려면 --cap-add 인수 두 개를 추가합니다:
docker run -d --name clickhouse-server \
   --cap-add=SYS_NICE \
   --cap-add=IPC_LOCK \
   --ulimit nofile=262144:262144 \
   --network clickhouse-net \
   -p 8123:8123 -p 9000:9000 -p 9009:9009 -p 9363:9363 \
   clickhouse/clickhouse-server:23.2
  1. 다음 명령을 사용하여 컨테이너에서 capability가 보이는지 확인하십시오:
apt-get update > /dev/null && apt-get install -y libcap2-bin > /dev/null && capsh --print

응답은 다음과 비슷합니다:

debconf: delaying package configuration, since apt-utils is not installed
WARNING: libcap needs an update (cap=40 should have a name).
Current: = cap_chown,cap_dac_override,cap_fowner,cap_fsetid,cap_kill,cap_setgid,cap_setuid,cap_setpcap,cap_net_bind_service,cap_net_raw,cap_ipc_lock,cap_sys_chroot,cap_sys_nice,cap_mknod,cap_audit_write,cap_setfcap+ep
Bounding set =cap_chown,cap_dac_override,cap_fowner,cap_fsetid,cap_kill,cap_setgid,cap_setuid,cap_setpcap,cap_net_bind_service,cap_net_raw,cap_ipc_lock,cap_sys_chroot,cap_sys_nice,cap_mknod,cap_audit_write,cap_setfcap
Ambient set =
Securebits: 00/0x0/1'b0
 secure-noroot: no (unlocked)
 secure-no-suid-fixup: no (unlocked)
 secure-keep-caps: no (unlocked)
 secure-no-ambient-raise: no (unlocked)
uid=0(root) euid=0(root)
gid=0(root)
groups=0(root)
Guessed mode: UNCERTAIN (0)
  1. ClickHouse의 두 capability를 모두 수동으로 설정합니다
setcap "cap_ipc_lock=+ep cap_sys_nice=+ep" /usr/bin/clickhouse
  1. capability가 적용되었는지 확인하십시오.
getcap -v /usr/bin/clickhouse

다음과 같이 표시됩니다:

/usr/bin/clickhouse = cap_ipc_lock,cap_sys_nice+ep
  1. ClickHouse 서버를 다시 시작하면 로그 메시지가 더 이상 표시되지 않습니다.

자세한 내용은 Linux capability에 대한 이 문서를 확인하십시오.

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