91 lines
2.8 KiB
Markdown
91 lines
2.8 KiB
Markdown
# 使用 sidecar 轮转日志
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## 背景
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业务程序如果将日志写到日志文件，如果没有自动轮转，可能会撑爆磁盘导致业务异常，甚至可能影响节点上其它 Pod。
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如果所使用的日志框架不支持日志轮转，或者不想改动业务代码，可以通过 sidecar 来对业务日志进行自动轮转，本文介绍如何基于 [docker-logrotate](https://github.com/imroc/docker-logrotate) 来实现日志轮转。
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## docker-logrotate 介绍
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[docker-logrotate](https://github.com/imroc/docker-logrotate) 是一个将 logrotate 容器化的开源项目，该项目自动构建出的容器镜像 [imroc/logrotate](https://hub.docker.com/r/imroc/logrotate) 是基于 alpine，预装了 logrotate，且支持多 CPU 架构的容器镜像，还可以通过环境变量的方式控制 logrotate 配置。
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## 示例一：自动轮转 nginx ingress 的日志
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配置 [ingress-nginx](https://github.com/kubernetes/ingress-nginx/tree/main/charts/ingress-nginx) helm chart 的 `values.yaml`：
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```yaml
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controller:
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config:
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access-log-path: /var/log/nginx/nginx_access.log
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error-log-path: /var/log/nginx/nginx_error.log
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extraVolumes:
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- name: log
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emptyDir: {}
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extraVolumeMounts:
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- name: log
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mountPath: /var/log/nginx
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extraContainers: # logrotate sidecar
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- name: logrotate
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image: imroc/logrotate:latest
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imagePullPolicy: IfNotPresent
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env:
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- name: LOGROTATE_FILE_PATTERN
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value: "/var/log/nginx/nginx_*.log"
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- name: LOGROTATE_FILESIZE
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value: "20M"
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- name: LOGROTATE_FILENUM
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value: "10"
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- name: CRON_EXPR
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value: "*/1 * * * *"
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- name: CROND_LOGLEVEL
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value: "7"
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volumeMounts:
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- name: log # share log directory
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mountPath: /var/log/nginx
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```
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## 示例二：自动轮转 nginx 日志
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```yaml
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: nginx
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spec:
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replicas: 1
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selector:
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matchLabels:
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app: nginx
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template:
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metadata:
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labels:
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app: nginx
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spec:
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containers:
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- name: nginx
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image: nginx:latest
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volumeMounts:
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- name: log # share log directory
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mountPath: /var/log/nginx
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- name: logrotate
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image: imroc/logrotate:latest
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env:
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- name: LOGROTATE_FILE_PATTERN
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value: "/var/log/nginx/*.log"
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- name: LOGROTATE_FILESIZE
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value: "20M"
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- name: LOGROTATE_FILENUM
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value: "10"
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- name: CRON_EXPR
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value: "*/1 * * * *"
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- name: CROND_LOGLEVEL
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value: "7"
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volumeMounts:
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- name: log # share log directory
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mountPath: /var/log/nginx
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volumes:
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- name: log
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emptyDir: {}
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```
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