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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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<span class="date moment">2019-05-21</span>
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<a href="/categories/%E7%AD%86%E8%A8%98">筆記</a>
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<span class="author"><a href="/author/eric-chang">Eric Chang</a></span>
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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>
<p>有的用 UTC，有的用localtime，就是沒碰到用 Asia/Taipei 的&hellip;.</p>
<p>
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>
<p>不過測試了一陣子的librenms 打算正式上線了</p>
<p>又不想重作一次，導致累積滿久的圖表資料都消失</p>
<p>所以開始找尋方法來面對這個問題</p>
<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>
<p>想說來試試看好了</p>
<p>不過呢，一開始依照這篇的說明，在docker-compose.yml 內加入</p>
<pre><code>web:
image: jarischaefer/docker-librenms
hostname: librenms
ports:
- &quot;8001:80&quot;
- &quot;44301:443&quot;
volumes:
- /etc/hosts:/etc/hosts
- /etc/localtime:/etc/localtime:ro
environment:
- TZ=&quot;Asia/Taipei&quot;
</code></pre>
<p>重起之後沒作用 0rz</p>
<p>於是我又加入了</p>
<pre><code> volumes:
- /etc/hosts:/etc/hosts
- /etc/localtime:/etc/localtime:ro
- /etc/timezone:/etc/timezone:ro
</code></pre>
<p>結果啟動直接報錯誤了..</p>
<p>看一下 log</p>
<pre><code>May 21 09:09:12 bbs012 syslog-ng[12]: syslog-ng starting up; version='3.13.2'
*** Running /etc/my_init.d/librenms_100_cron...
*** Running /etc/my_init.d/librenms_101_ssl...
*** Running /etc/my_init.d/librenms_102_ipv6...
*** Running /etc/my_init.d/librenms_103_timezone...
/etc/my_init.d/librenms_103_timezone: line 4: /etc/timezone: Read-only file system
*** /etc/my_init.d/librenms_103_timezone failed with status 1
*** Killing all processes...
</code></pre>
<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>
<p>先來看一下那個 librenms_103_timezone 在幹什麼好了</p>
<pre><code>docker exec -it librenms_web_1 cat /etc/my_init.d/librenms_103_timezone
#!/bin/bash -e
if [ -n &quot;$TZ&quot; ]; then
ln -snf /usr/share/zoneinfo/$TZ /etc/localtime &amp;&amp; echo $TZ &gt; /etc/timezone
if [ ! -f /etc/php/7.3/cli/conf.d/100-timezone.ini ]; then
echo &quot;date.timezone=$TZ&quot; &gt; /etc/php/7.3/cli/conf.d/100-timezone.ini
fi
if [ ! -f /etc/php/7.3/fpm/conf.d/100-timezone.ini ]; then
echo &quot;date.timezone=$TZ&quot; &gt; /etc/php/7.3/fpm/conf.d/100-timezone.ini
fi
fi
2019-05-21 17:33:46 [mini@s013 librenms]$
</code></pre>
<p>OK ，這裡的確是用傳進來的 $TZ 在設定timezone 沒錯</p>
<p>可是我前面已經改過 docker-compose.yml</p>
<p>有把 TZ帶進來了啊？再來確認一下</p>
<pre><code>docker exec -it librenms_web_1 cat /etc/timezone
&quot;Asia/Taipei&quot;
</code></pre>
<p>咦，沒錯啊？ 欸斗，等等，那兩個 &ldquo;&rdquo; 有點刺眼&hellip;</p>
<p>跟本機的比對一下看看</p>
<pre><code>2019-05-21 17:36:20 [mini@s013 librenms]$ docker exec -it librenms_web_1 cat /etc/timezone
&quot;Asia/Taipei&quot;
2019-05-21 17:36:23 [mini@s013 librenms]$ cat /etc/timezone
Asia/Taipei
2019-05-21 17:37:10 [mini@s013 librenms]$
</code></pre>
<p>嗯，的確，本機的格式的確不包含那兩個 &ldquo;&rdquo;</p>
<p>那就改掉再來試試看吧&hellip;改成底下這樣</p>
<pre><code> environment:
- TZ=Asia/Taipei
</code></pre>
<p>重起 docker ，然後確認時間看看</p>
<pre><code>2019-05-21 17:39:00 [mini@s013 librenms]$ docker-compose down;docker-compose up -d
Stopping librenms_web_1 ... done
Stopping librenms_mysql_1 ... done
Removing librenms_web_1 ... done
Removing librenms_mysql_1 ... done
Removing network librenms_default
Creating network &quot;librenms_default&quot; with the default driver
Creating librenms_mysql_1 ... done
Creating librenms_web_1 ... done
2019-05-21 17:39:22 [mini@s013 librenms]$ docker exec -it librenms_web_1 cat /etc/timezone
Asia/Taipei
2019-05-21 17:39:42 [mini@s013 librenms]$ docker exec -it librenms_web_1 date
Tue May 21 17:39:48 CST 2019
2019-05-21 17:39:48 [mini@s013 librenms]$
</code></pre>
<p>OK ，果然沒有問題了！</p>
<p>雖然是小小的&rdquo;&rdquo; ，還是要特別注意啊！</p>
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