安裝Jenkins到Ubuntu server推薦采用官方文檔描述的方法：http://pkg.jenkins-ci.org/debian/
很快就可以使用了。而且這種方法能夠方便的升級到最新版本。不過端口號是8080，我的另一個程序用到了8080，怎麼修改呢？
網上一些方法介紹通過nginx或者apache將80端口映射到8080, 還有人說用iptables, 這都是間接迂回。我就是不想讓jenkins占用8080端口。
通過檢查/etc/init.d/jenkins腳本，發現其實就需要做兩步：
1. 修改do_start函數的check_tcp_port命令，端口號從8080換成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，將端口8080改成8082
然後重新啟動jenkins, 檢查一下：
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。
更多Ubuntu相關信息見Ubuntu 專題頁面 http://www.linuxidc.com/topicnews.aspx?tid=2
