One trick to solve the error "Cannot fetch deployment URL via curl"!

check_mk is a tool that helps you configure nagios monitoring server. Then while configuring one of the machines I encountered the following error:

 ERROR Cannot fetch deployment URL via curl：Couldn't resolve host。The given remote host was not resolved。

This error occurred when I tried to register the machine to the monitoring server using the following command:

 root@kerneltalks# /usr/bin/cmk-update-agent register -s monitor.kerneltalks.com -i master -H `hostname` -p http -U omdadmin -S ASFKWEFUNSHEFKG -v 

in:

-s 指明监控服务器
-i 指定服务器上 Check_MK 站点的名称
-H 指定 agent 所在的主机名
-p 为协议，可以是 http 或 https （默认为 https）
-U 允许下载 agent 的用户 ID
-S 为密码。用户的自动操作密码（当是自动用户时）

As you can see from the error, the command cannot resolve the DNS name of the monitoring server, monitor.kerneltalks.com.

solution:

Super simple. Check /etc/resolv.conf to make sure your DNS is configured correctly. If this problem still cannot be solved, you can directly specify its IP in /etc/hosts.

root@kerneltalks# cat /etc/hosts
10.0.10.9 monitor.kerneltalks.com

That’s it. You can now register successfully.

root@kerneltalks # /usr/bin/cmk-update-agent register -s monitor.kerneltalks.com -i master -H `hostname` -p http -U omdadmin -S ASFKWEFUNSHEFKG -v
Going to register agent at deployment server
Successfully registered agent for deployment.
You can now update your agent by running 'cmk-update-agent -v'
Saved your registration settings to /etc/cmk-update-agent.state.

In addition, you can also directly specify the IP address for -s, which is not that much trouble!

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