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<title> [筆記] 修改 docker 容器內的時區 - Change Timezone in Docker | MCの飄狂山莊㊣</title>
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<h3><a href="/post/change-timezone-in-docker/">[筆記] 修改 docker 容器內的時區 - Change Timezone in Docker</a></h3>
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<div class="meta">
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<span class="date moment">2019-05-21</span>
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<span class="author"><a href="/author/eric-chang">Eric Chang</a></span>
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</div>
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<p>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</p>
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<p>有的用 UTC，有的用localtime，就是沒碰到用 Asia/Taipei 的….</p>
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<p>
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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</p>
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<p>不過測試了一陣子的librenms 打算正式上線了</p>
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<p>又不想重作一次，導致累積滿久的圖表資料都消失</p>
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<p>所以開始找尋方法來面對這個問題</p>
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<p>本來看了這篇 <a href="https://www.arthurtoday.com/2016/07/how-to-setup-docker-container-timezone-host.html">https://www.arthurtoday.com/2016/07/how-to-setup-docker-container-timezone-host.html</a></p>
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<p>想說來試試看好了</p>
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<p>不過呢，一開始依照這篇的說明，在docker-compose.yml 內加入</p>
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<pre><code>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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</code></pre>
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<p>重起之後沒作用 0rz</p>
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<p>於是我又加入了</p>
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<pre><code> 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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</code></pre>
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<p>結果啟動直接報錯誤了..</p>
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<p>看一下 log</p>
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<pre><code>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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</code></pre>
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<p>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？</p>
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<p>先來看一下那個 librenms_103_timezone 在幹什麼好了</p>
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<pre><code>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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</code></pre>
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<p>OK ，這裡的確是用傳進來的 $TZ 在設定timezone 沒錯</p>
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<p>可是我前面已經改過 docker-compose.yml</p>
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<p>有把 TZ帶進來了啊？再來確認一下</p>
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<pre><code>docker exec -it librenms_web_1 cat /etc/timezone
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"Asia/Taipei"
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</code></pre>
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<p>咦，沒錯啊？ 欸斗，等等，那兩個 “” 有點刺眼…</p>
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<p>跟本機的比對一下看看</p>
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<pre><code>2019-05-21 17:36:20 [mini@s013 librenms]$ 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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</code></pre>
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<p>嗯，的確，本機的格式的確不包含那兩個 “”</p>
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<p>那就改掉再來試試看吧…改成底下這樣</p>
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<pre><code> environment:
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- TZ=Asia/Taipei
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</code></pre>
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<p>重起 docker ，然後確認時間看看</p>
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<pre><code>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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</code></pre>
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<p>OK ，果然沒有問題了！</p>
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<p>雖然是小小的”” ，還是要特別注意啊！</p>
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<a href="https://github.com/Lednerb/bilberry-hugo-theme" target="_blank">Bilberry Hugo Theme</a>
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