Recently, with the support of the team leader, I have been tossing Jenkins, and it has also been extended to two or three groups. During the period, a QQ group related to jenkins was also added. A buddy in the group has a very strange question:
centos 7.4 64-bit, using the yum installation method shown in the link below.
https://pkg.jenkins.io/redhat-stable/
In fact, these are nothing, jenkins finally started after several tossing. Using curl localhost:port is also able to access correctly.
But it doesn't work if you access it in an external browser. And the external use telnet to scan the port, it is also detected that the port is not open.
We turned the firewall off and on inside and out (opening and adding ports for release range), but it didn't work.
In the end, I asked an operation and maintenance buddy and prompted us to say: it should be the management background of Alibaba Cloud, and there is a layer of firewall.
In the end, I tried it, and it turned out to be the pot of Ali's management backstage. (The following are the open ports of Alibaba Cloud's background management interface)
How to open the Aliyun port, Baidu search will have it.