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如何查看docker-compose健康检查日志？

loggingdockerdocker-composehealth-monitoring
114

在我的 docker-compose.yml 文件中，我有以下的 service healthcheck 部分。我想知道 MariaDB 是否已经准备好处理查询。service 名为 cmd 的服务被配置为依赖于 condition: service_healthy。

  db:
    image: mariadb:10
    environment:
      MYSQL_RANDOM_ROOT_PASSWORD: 1
      MYSQL_USER: user
      MYSQL_PASSWORD: password
      MYSQL_DATABASE: database
    healthcheck:
      test: ["CMD", "mysql", "--user=user", "--password=password", "--execute='SELECT 1'", "--host=127.0.0.1", "--port=3306"]
      interval: 1s
      retries: 30

该健康检查无法正常工作，表明该服务不健康。

如何检查test命令的输出？

3个回答
224

您可以使用：

docker inspect --format "{{json .State.Health }}" <container name> | jq

输出：

{
    "Status": "unhealthy",
    "FailingStreak": 63,
    "Log": [
        {
            "Start": "2017-03-11T20:49:19.668895201+03:30",
            "End": "2017-03-11T20:49:19.735722044+03:30",
            "ExitCode": 1,
            "Output": "ERROR 1064 (42000) at line 1: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ''SELECT 1'' at line 1\n"
        }
    ]
}

请查找输出部分。
仅获取输出：
docker inspect --format "{{json .State.Health }}" mariadb_db_1 | jq '.Log[].Output'

对于Swarm模式，请使用以下格式（感谢@shotgunner指出）：

{{json.Spec.TaskTemplate.ContainerSpec.Healthcheck}}

可随意将jq替换为您用于json美化的其他工具。

1
你好，你知道有什么方法可以将这些日志附加到写入入口点的同一JSON日志文件中吗？我想在执行Docker日志的健康检查日志中看到所有这些日志，都在同一个地方。 - Alejandro Galera
2
在Swarm模式和管理器中，{{json .State.Health}}无法使用。请改用{{json .Spec.TaskTemplate.ContainerSpec.Healthcheck}}。 - Mojtaba Kamyabi
2
如果无论如何都要使用 jq，那么所有的查询都可以通过它来完成；这样更简短、更美观：docker inspect $CONTAINER | jq '.[].State.Health'。 - Alex Povel
我想知道第一条命令的格式是否正确。它有一个可疑的空格。 - Stephane
8

docker-compose ps 命令可以显示每个服务的状态，包括健康状态（如果定义了 healthcheck）。这对于基本概览非常有用。

% docker-compose ps
                Name                                Command                       State                                       Ports                            
----------------------------------------------------------------------------------------------------------------------------------------------------------------
remix-theme-editor_analytics_1            /bin/sh -c /analytics/run. ...   Up                                                                                   
remix-theme-editor_base_1                 /bin/bash                        Exit 0                                                                               
remix-theme-editor_flower_1               /entrypoint --environment  ...   Exit 137                                                                             
remix-theme-editor_frontend_1             /bin/sh -c perl -p -i -e ' ...   Exit 137                                                                             
remix-theme-editor_js-app_1               npm run                          Exit 0                                                                               
remix-theme-editor_mq_1                   docker-entrypoint.sh rabbi ...   Up (healthy)            15671/tcp, 15672/tcp, 25672/tcp, 4369/tcp, 5671/tcp, 5672/tcp
remix-theme-editor_mysql-migration_1      /entrypoint_mysql-migratio ...   Exit 0                                                                               
remix-theme-editor_mysql_1                /bin/sh -c /entrypoint_wra ...   Up (health: starting)   127.0.0.2:3308->3306/tcp                                     
remix-theme-editor_page-renderer_1        npm run start:watch              Up                                                                                   
remix-theme-editor_python-app_1           /entrypoint                      Exit 2                                                                               
remix-theme-editor_redis_1                docker-entrypoint.sh /bin/ ...   Up (health: starting)   6379/tcp                                                     
remix-theme-editor_scheduler_1            /entrypoint --environment  ...   Exit 137                                                                             
remix-theme-editor_socket_1               /entrypoint --environment  ...   Exit 1                                                                               
remix-theme-editor_static-builder_1       npm run watch                    Up                                                                                   
remix-theme-editor_static-http_1          nginx -g daemon off;             Up                      127.0.0.2:6544->443/tcp, 80/tcp                              
remix-theme-editor_web_1                  /entrypoint --environment  ...   Exit 1                                                                               
remix-theme-editor_worker_1               /entrypoint --environment  ...   Exit 1                                                                               
remix-theme-editor_worker_screenshots_1   /entrypoint --environment  ...   Exit 1

如果您需要更多细节，可结合使用docker inspect和docker ps -q <service-name>。

% docker inspect --format "{{json .State.Health }}" $(docker-compose ps -q mq) | jq
{
  "Status": "starting",
  "FailingStreak": 48,
  "Log": [
    {
      "Start": "2018-10-03T00:40:18.671527745-05:00",
      "End": "2018-10-03T00:40:18.71729051-05:00",
      "ExitCode": -1,
      "Output": "OCI runtime exec failed: exec failed: container_linux.go:348: starting container process caused \"exec: \\\"nc\\\": executable file not found in $PATH\": unknown"
    },
...

您可以通过执行健康检查代码来自行调试健康检查。例如：

% docker exec -it $(docker-compose ps -q socket) nc -w2 127.0.0.1 5672
(UNKNOWN) [127.0.0.1] 5672 (?) : Connection refused

你也可以在shell中实现同样的功能：

% docker exec -it $(docker-compose ps -q socket) bash
root@b5da5207d344:~/src# nc -w2 127.0.0.1 5672
(UNKNOWN) [127.0.0.1] 5672 (?) : Connection refused
root@b5da5207d344:~/src# echo $?
1

最后，在第一个终端窗口中，您可以简单地使用docker-compose up命令，并在另一个终端窗口中使用docker-compose logs -f命令。这将显示由docker-compose管理的所有容器的日志。
你好，你知道如何将这些日志附加到写入入口点的同一json日志文件中吗？我想在执行“docker logs”时查看healthcheck日志，所有日志都在同一个位置。 - Alejandro Galera
2
在Swarm模式下： 1. 首先在管理节点中使用docker service ps service_name命令查找失败任务的ID和相应的节点。
manager$ docker service ps service_name
ID                  NAME                 IMAGE            NODE                DESIRED STATE       CURRENT STATE               ERROR                              PORTS
liwww3qzg9dz        service_name.1       image_name:1.3   s-3                 Running             Running 27 seconds ago                                         
hcgxmwk2efj0         \_ service_name.1   image_name:1.3   s-3                 Shutdown            Failed about a minute ago   "task: non-zero exit (137): do…"

在这个例子中，hcgxmwk2efj0 是任务 ID，s-3 是节点名称。
然后，在管理者中使用 docker inspect --format "{{json .Status.ContainerStatus.ContainerID }}" task_id 命令获取容器 ID。
manager$ docker inspect --format "{{json .Status.ContainerStatus.ContainerID }}" hcgxmwk2efj0
"412b09d5244047b31471248fd9a0807e5ea42406fb8f5b1701df2244933e30c8"
  1. 然后ssh到那个节点，并使用命令docker inspect --format "{{json .State.Health }}" container_id | jq获取健康检查日志。（在此命令中，| jq不是必需的）
s-3$ docker inspect --format "{{json .State.Health }}" 412b09d5244047b31471248fd9a0807e5ea42406fb8f5b1701df2244933e30c8 | jq
{
  "Status": "unhealthy",
  "FailingStreak": 3,
  "Log": [
    {
      "Start": "2021-09-07T06:10:05.233163051Z",
      "End": "2021-09-07T06:10:07.585487343Z",
      "ExitCode": 0,
      "Output": "... log 1 ..."
    },
    {
      "Start": "2021-09-07T06:10:37.644936244Z",
      "End": "2021-09-07T06:10:39.881196276Z",
      "ExitCode": 0,
      "Output": "... log 2 ..."
    },
    {
      "Start": "2021-09-07T06:11:10.16172012Z",
      "End": "2021-09-07T06:11:25.161912411Z",
      "ExitCode": -1,
      "Output": "Health check exceeded timeout (15s)"
    },
    {
      "Start": "2021-09-07T06:11:55.297395088Z",
      "End": "2021-09-07T06:12:10.302928565Z",
      "ExitCode": -1,
      "Output": "Health check exceeded timeout (15s)"
    },
    {
      "Start": "2021-09-07T06:12:40.371234778Z",
      "End": "2021-09-07T06:12:55.371393914Z",
      "ExitCode": -1,
      "Output": "Health check exceeded timeout (15s)"
    }
  ]
}
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