一、添加apt-key之后update报如下错

Certificate verification failed: The certificate is NOT trusted. The certificate chain uses expired certificate. Could not handshake: Error in the certificate verification. [IP: xxxxxxx 443] Reading package lists... Done

解决方案：

sudo apt install ca-certificates

sudo apt-get update

二、修改默认端口

#文件1  /etc/init.d/jenkins 
#搜索8080 替换成需要修改的端口

#文件2 /etc/default/jenkins
HTTP_PORT=xxxx

#文件3 /usr/lib/systemd/system/jenkins.service
# 修改为想要的端口
Environment="JENKINS_PORT=8889"

# 重新加载配置文件
systemctl daemon-reload

三、修改账号密码

寻找对应的账号文件 /var/lib/jenkins/users/账号名 _xxxxxxxxxxxx/config.xml，或者直接执行命令

sudo find / -name config.xml

然后修改<passwordHash>节点，将其内容替换为

#jbcrypt:$2a$10$DdaWzN64JgUtLdvxWIflcuQu2fgrrMSAMabF5TSrGK5nXitqK9ZMS
//注意前后不要有空格

保存，然后重启jenkins，重启后密码为111111