Docker Logging
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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
Logging-Methoden
- Die Logging-Methode kann durch die Auswahl eines anderen Logging-Treibers verändert werden
- über docker run […] --log-driver log_driver kann der Treiber eingestellt werden
| Treiber | Beschreibung |
|---|---|
| none | No logs are available for the container and docker logs does not return any output. |
| local | Logs are stored in a custom format designed for minimal overhead. |
| json-file | The logs are formatted as JSON. The default logging driver for Docker. |
| syslog | Writes logging messages to the syslog facility. The syslog daemon must be running on the host machine. |
| journald | Writes log messages to journald. The journald daemon must be running on the host machine. |
| gelf | Writes log messages to a Graylog Extended Log Format (GELF) endpoint such as Graylog or Logstash. |
| fluentd | Writes log messages to fluentd (forward input). The fluentd daemon must be running on the host machine. |
| awslogs | Writes log messages to Amazon CloudWatch Logs. |
| splunk | Writes log messages to splunk using the HTTP Event Collector. |
| etwlogs | Writes log messages as Event Tracing for Windows (ETW) events. Only available on Windows platforms. |
| gcplogs | Writes log messages to Google Cloud Platform (GCP) Logging. |
| logentries | Writes log messages to Rapid7 Logentries. |