Jenkins是一种持续集成工具，基于Java开发，在Ubuntu系统中，升级Jenkins的时候出现端口被占用的问题，通过修改Jenkins端口号来解决这个问题，下面就给大家介绍下Ubuntu如何修改Jenkins端口号。
端口号是8080，另一个程序用到了8080，修改端口号不让jenkins占用8080端口。
通过检查/etc/init.d/jenkins脚本，发现其实就需要做两步：
1. 修改do_start函数的check_tcp_port命令，端口号从8080换成8082
#
# Function that starts the daemon/service
#
do_start（）
{
# the default location is /var/run/jenkins/jenkins.pid but the parent directory needs to be created
mkdir `dirname $PIDFILE` 》 /dev/null 2》&1 || true
chown $JENKINS_USER `dirname $PIDFILE`
# Return
# 0 if daemon has been started
# 1 if daemon was already running
# 2 if daemon could not be started
$DAEMON $DAEMON_ARGS --running && return 1
# Verify that the jenkins port is not already in use， winstone does not exit
# even for BindException
check_tcp_port “http” “$HTTP_PORT” “8082” || return 1
# If the var MAXOPENFILES is enabled in /etc/default/jenkins then set the max open files to the
# proper value
if ［ -n “$MAXOPENFILES” ］; then
［ “$VERBOSE” ！= no ］ && echo Setting up max open files limit to $MAXOPENFILES
ulimit -n $MAXOPENFILES
fi
# --user in daemon doesn‘t prepare environment variables like HOME， USER， LOGNAME or USERNAME，
# so we let su do so for us now
$SU -l $JENKINS_USER --shell=/bin/bash -c “$DAEMON $DAEMON_ARGS -- $JAVA $JAVA_ARGS -jar $JENKINS_WAR $JENKINS_ARGS” || return 2
}
2.修改/etc/default/jenkins文件，将端口8080改成8082
然后重新启动jenkins， 检查一下：
ps -def | grep java
jenkins 7234 7233 99 11:14 ？ 00:00:04 /usr/bin/java -jar /usr/share/jenkins/jenkins.war --webroot=/var/cache/jenkins/war --httpPort=8082 --ajp13Port=-1
修改成功。
上面就是Ubuntu更改Jenkins端口号的方法介绍了，只需两步就可将Jenkins的端口号进行修改，不会占用端口8080。
