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---
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title: "[筆記] 修改 docker 容器內的時區 - Change Timezone in Docker"
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date: 2019-05-21T17:25:15+08:00
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noSummary: false
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featuredImage: "https://h.cowbay.org/images/post-default-3.jpg"
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categories: ['筆記']
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tags: ['docker','timezone']
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author: "Eric Chang"
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---
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最近一直在玩一些docker，不過老是會碰到歪果扔寫的東西，時區都不一致
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有的用 UTC，有的用localtime，就是沒碰到用 Asia/Taipei 的....
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<!--more-->
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之前因為沒有要上線，所以這個問題可以當烏龜忽略過去
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不過測試了一陣子的librenms 打算正式上線了
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又不想重作一次，導致累積滿久的圖表資料都消失
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所以開始找尋方法來面對這個問題
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本來看了這篇 https://www.arthurtoday.com/2016/07/how-to-setup-docker-container-timezone-host.html
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想說來試試看好了
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不過呢，一開始依照這篇的說明，在docker-compose.yml 內加入
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```
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web:
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image: jarischaefer/docker-librenms
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hostname: librenms
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ports:
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- "8001:80"
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- "44301:443"
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volumes:
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- /etc/hosts:/etc/hosts
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- /etc/localtime:/etc/localtime:ro
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environment:
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- TZ="Asia/Taipei"
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```
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重起之後沒作用 0rz
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於是我又加入了
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```
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volumes:
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- /etc/hosts:/etc/hosts
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- /etc/localtime:/etc/localtime:ro
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- /etc/timezone:/etc/timezone:ro
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```
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結果啟動直接報錯誤了..
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看一下 log
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```
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May 21 09:09:12 bbs012 syslog-ng[12]: syslog-ng starting up; version='3.13.2'
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*** Running /etc/my_init.d/librenms_100_cron...
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*** Running /etc/my_init.d/librenms_101_ssl...
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*** Running /etc/my_init.d/librenms_102_ipv6...
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*** Running /etc/my_init.d/librenms_103_timezone...
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/etc/my_init.d/librenms_103_timezone: line 4: /etc/timezone: Read-only file system
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*** /etc/my_init.d/librenms_103_timezone failed with status 1
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*** Killing all processes...
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```
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所以這個檔案不能改成 ro ，不過如果不能唯獨，那啟動docker的時候應該會被蓋掉吧？
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先來看一下那個 librenms_103_timezone 在幹什麼好了
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```
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docker exec -it librenms_web_1 cat /etc/my_init.d/librenms_103_timezone
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#!/bin/bash -e
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if [ -n "$TZ" ]; then
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ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
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if [ ! -f /etc/php/7.3/cli/conf.d/100-timezone.ini ]; then
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echo "date.timezone=$TZ" > /etc/php/7.3/cli/conf.d/100-timezone.ini
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fi
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if [ ! -f /etc/php/7.3/fpm/conf.d/100-timezone.ini ]; then
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echo "date.timezone=$TZ" > /etc/php/7.3/fpm/conf.d/100-timezone.ini
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fi
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fi
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2019-05-21 17:33:46 [mini@s013 librenms]$
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```
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OK ，這裡的確是用傳進來的 $TZ 在設定timezone 沒錯
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可是我前面已經改過 docker-compose.yml
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有把 TZ帶進來了啊？再來確認一下
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```
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docker exec -it librenms_web_1 cat /etc/timezone
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"Asia/Taipei"
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```
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咦，沒錯啊？ 欸斗，等等，那兩個 "" 有點刺眼...
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跟本機的比對一下看看
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```
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2019-05-21 17:36:20 [mini@s013 librenms]$ docker exec -it librenms_web_1 cat /etc/timezone
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"Asia/Taipei"
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2019-05-21 17:36:23 [mini@s013 librenms]$ cat /etc/timezone
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Asia/Taipei
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2019-05-21 17:37:10 [mini@s013 librenms]$
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```
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嗯，的確，本機的格式的確不包含那兩個 ""
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那就改掉再來試試看吧...改成底下這樣
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```
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environment:
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- TZ=Asia/Taipei
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```
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重起 docker ，然後確認時間看看
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```
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2019-05-21 17:39:00 [mini@s013 librenms]$ docker-compose down;docker-compose up -d
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Stopping librenms_web_1 ... done
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Stopping librenms_mysql_1 ... done
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Removing librenms_web_1 ... done
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Removing librenms_mysql_1 ... done
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Removing network librenms_default
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Creating network "librenms_default" with the default driver
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Creating librenms_mysql_1 ... done
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Creating librenms_web_1 ... done
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2019-05-21 17:39:22 [mini@s013 librenms]$ docker exec -it librenms_web_1 cat /etc/timezone
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Asia/Taipei
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2019-05-21 17:39:42 [mini@s013 librenms]$ docker exec -it librenms_web_1 date
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Tue May 21 17:39:48 CST 2019
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2019-05-21 17:39:48 [mini@s013 librenms]$
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```
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OK ，果然沒有問題了！
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雖然是小小的"" ，還是要特別注意啊！
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