Docker Logging

Syntax

• Für einen Container
• docker logs [OPTIONS] NAME
• Für Services/Tasks eines Docker-Swarms
• docker service logs [OPTIONS] NAME
• Normalerweise werden Standard Output und Standard Error dem Docker-log übergeben.

Beispiele

Containerprotokolle anzeigen

• docker logs nginx

/docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration
/docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/
/docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh
10-listen-on-ipv6-by-default.sh: info: Getting the checksum of /etc/nginx/conf.d/default.conf
10-listen-on-ipv6-by-default.sh: info: Enabled listen on IPv6 in /etc/nginx/conf.d/default.conf
/docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh
/docker-entrypoint.sh: Launching /docker-entrypoint.d/30-tune-worker-processes.sh
/docker-entrypoint.sh: Configuration complete; ready for start up
2023/02/13 07:11:47 [notice] 1#1: using the "epoll" event method
2023/02/13 07:11:47 [notice] 1#1: nginx/1.23.3
2023/02/13 07:11:47 [notice] 1#1: built by gcc 10.2.1 20210110 (Debian 10.2.1-6) 
2023/02/13 07:11:47 [notice] 1#1: OS: Linux 5.4.0-137-generic
2023/02/13 07:11:47 [notice] 1#1: getrlimit(RLIMIT_NOFILE): 1048576:1048576
2023/02/13 07:11:47 [notice] 1#1: start worker processes
2023/02/13 07:11:47 [notice] 1#1: start worker process 29
2023/02/13 07:11:47 [notice] 1#1: start worker process 30
2023/02/13 07:11:47 [notice] 1#1: start worker process 31
2023/02/13 07:11:47 [notice] 1#1: start worker process 32
2023/02/13 07:11:47 [notice] 1#1: start worker process 33
2023/02/13 07:11:47 [notice] 1#1: start worker process 34
2023/02/13 07:11:47 [notice] 1#1: start worker process 35
2023/02/13 07:11:47 [notice] 1#1: start worker process 36

neu einkommende Protokolleinträge anzeigen

• docker logs -f nginx

/docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration
/docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/
/docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh
10-listen-on-ipv6-by-default.sh: info: Getting the checksum of /etc/nginx/conf.d/default.conf
10-listen-on-ipv6-by-default.sh: info: Enabled listen on IPv6 in /etc/nginx/conf.d/default.conf
/docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh
/docker-entrypoint.sh: Launching /docker-entrypoint.d/30-tune-worker-processes.sh
/docker-entrypoint.sh: Configuration complete; ready for start up
2023/02/13 07:11:47 [notice] 1#1: using the "epoll" event method
2023/02/13 07:11:47 [notice] 1#1: nginx/1.23.3
2023/02/13 07:11:47 [notice] 1#1: built by gcc 10.2.1 20210110 (Debian 10.2.1-6) 
2023/02/13 07:11:47 [notice] 1#1: OS: Linux 5.4.0-137-generic
2023/02/13 07:11:47 [notice] 1#1: getrlimit(RLIMIT_NOFILE): 1048576:1048576
2023/02/13 07:11:47 [notice] 1#1: start worker processes
2023/02/13 07:11:47 [notice] 1#1: start worker process 29
2023/02/13 07:11:47 [notice] 1#1: start worker process 30
2023/02/13 07:11:47 [notice] 1#1: start worker process 31
2023/02/13 07:11:47 [notice] 1#1: start worker process 32
2023/02/13 07:11:47 [notice] 1#1: start worker process 33
2023/02/13 07:11:47 [notice] 1#1: start worker process 34
2023/02/13 07:11:47 [notice] 1#1: start worker process 35
2023/02/13 07:11:47 [notice] 1#1: start worker process 36

CPU- und Speicherauslastung

• docker stats

  CONTAINER ID NAME CPU % MEM USAGE / LIMIT MEM % NET I/O BLOCK I/O PIDS 42f4afd9ad3d nginx 0.00% 9.316MiB / 11.46GiB 0.08% 1.53kB / 0B 4.1kB / 8.19kB 9

• für bestimmte Container

• docker stats nginx

  CONTAINER ID NAME CPU % MEM USAGE / LIMIT MEM % NET I/O BLOCK I/O PIDS 42f4afd9ad3d nginx 0.00% 9.316MiB / 11.46GiB 0.08% 1.53kB / 0B 4.1kB / 8.19kB 9

Laufende Prozesse in einem Container

• docker top nginx

UID                 PID                 PPID                C                   STIME               TTY                 TIME                CMD
root                112223              112199              0                   07:11               ?                   00:00:00            nginx: master process nginx -g daemon off;
systemd+            112291              112223              0                   07:11               ?                   00:00:00            nginx: worker process
systemd+            112292              112223              0                   07:11               ?                   00:00:00            nginx: worker process
systemd+            112293              112223              0                   07:11               ?                   00:00:00            nginx: worker process
systemd+            112294              112223              0                   07:11               ?                   00:00:00            nginx: worker process
systemd+            112295              112223              0                   07:11               ?                   00:00:00            nginx: worker process
systemd+            112296              112223              0                   07:11               ?                   00:00:00            nginx: worker process
systemd+            112297              112223              0                   07:11               ?                   00:00:00            nginx: worker process
systemd+            112298              112223              0                   07:11               ?                   00:00:00            nginx: worker process