获取服务器运行状况的 Bash 脚本
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Bash script to get server health
提问by Andrew Schleifer
Im looking to monitor some aspects of a farm of servers that are necessary for the application that runs on them.
我希望监视服务器群的某些方面，这些方面对于在其上运行的应用程序是必需的。
Basically, Im looking to have a file on each machine, which when accessed via http (on a vlan), with curl, that will spit out information Im looking for, which I can log into the database with dameon that sits in a loop and checks the health of all the servers one by one.
基本上，我希望在每台机器上都有一个文件，当通过 http（在 vlan 上）使用 curl 访问时，它将吐出我正在寻找的信息，我可以使用位于循环中的 dameon 登录到数据库中，一一检查所有服务器的健康状况。
The info Im looking to get is
我希望得到的信息是
<load>server load</load>
<free>md0 free space in MB</free>
<total>md0 total space in MB</total>
<processes># of nginx processes</processes>
<time>timestamp</time>
Whats the best way of doing that?
这样做的最佳方法是什么？
EDIT: We are using cacti and opennms, however what Im looking for here is data that is necessary for the application that runs on these servers. I dont want to complicate it by having it rely on any 3rd party software to fetch this basic data which can be gotten with a few linux commands.
编辑：我们正在使用 cacti 和 opennms，但是我在这里寻找的是在这些服务器上运行的应用程序所需的数据。我不想让它依赖任何 3rd 方软件来获取这个基本数据，这些数据可以通过一些 linux 命令获得，从而使它复杂化。
回答by Andrew Schleifer
Make a cron entry that:
创建一个 cron 条目：
- executes a shell script every few minutes (or whatever frequency you want)
- saves the output in a directory that's published by the web server
- 每隔几分钟（或您想要的任何频率）执行一次 shell 脚本
- 将输出保存在 Web 服务器发布的目录中
Assuming your text is literally what you want, this will get you 90% of the way there:
假设您的文本字面上是您想要的，这将使您达到 90%：
#!/usr/bin/env bash
LOAD=$(uptime | cut -d: -f5 | cut -d, -f1)
FREE=$(df -m / | tail -1 | awk '{ print }')
TOTAL=$(df -m / | tail -1 | awk '{ print }')
PROCESSES=$(ps aux | grep [n]ginx | wc -l)
TIME=$(date)
cat <<-EOF
<load>$LOAD</load>
<free>$FREE</free>
<total>$TOTAL</total>
<processes>$PROCESSES</processes>
<time>$TIME</time>
EOF
Sample output:
示例输出：
<load> 0.05</load>
<free>9988</free>
<total>13845</total>
<processes>6</processes>
<time>Wed Apr 18 22:14:35 CDT 2012</time>
