# logging

该选项用于服务的日志配置。

```
logging:
  driver: syslog
  options:
    syslog-address: "tcp://192.168.0.42:123"
```

driver选项为服务的容器指定了一个日志驱动。等同于docker run --log-driver。

默认值是json-file。

```
driver: "json-file"
```

```
driver: "syslog"
```

```
driver: "none"
```

Note:

只有json-file和journald驱动可以让日志在docker-compose up和docker-compose logs时直接可用。使用任何其他的日志驱动都不会打印任何日志。

通过options键为logging驱动配置选项。options选项是键值对。下面是syslog选项示例：

```
driver: "syslog"
options:
  syslog-address: "tcp://192.168.0.42:123"
```

默认日志驱动有选项可以用来限制日志的存储数量。

```
options:
  max-size: "200k"
  max-file: "10"
```

上面的示例显示了最多可以存储200kb大小的日志，然后会轮询它们。单独保存日志的文件的大小可以通过max-file选项指定。一旦日志的增长超过了最大的限制，老的日志文件会被删除来允许新的日志文件被存储。

这里有一个限制日志存储的实例：

```
version: "3.9"
services:
  some-service:
    image: some-service
    logging:
      driver: "json-file"
      options:
        max-size: "200k"
        max-file: "10"
```

Note：

不同的日志驱动可以使用的options是不同的，这里用到的选项只能用于json-file日志驱动，无法用于其他日志驱动。


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