【jenkins 安装】jenkins dead but pid file exists

centos6.2 安装jenkins
1.    wget -O /etc/yum.repos.d/jenkins.repo

2.    rpm --import

3.     yum install jenkins

启动jenkins
4.     /etc/init.d/jenkins start

查看jenkins 服务状态
5.     /etc/init.d/jenkins status
jenkins dead but pid file exists

排查了多方面原因，最后定为与jdk的原因，由于系统自身有jdk，我手动又安装了jdk。
6.     rpm -qa |grep java    
sun-javadb-client-10.6.2-1.1.i386
sun-javadb-core-10.6.2-1.1.i386
sun-javadb-demo-10.6.2-1.1.i386
sun-javadb-javadoc-10.6.2-1.1.i386
java-1.5.0-gcj-1.5.0.0-29.1.el6.x86_64
sun-javadb-common-10.6.2-1.1.i386
sun-javadb-docs-10.6.2-1.1.i386
java_cup-0.10k-5.el6.x86_64

卸载掉系统自带安装的jdk
7.     yum -y remove java*

在脚本文件里加上红色java的路径，要不程序找不到java的启动环境
8.    vim /etc/init.d/jenkins

for candidate in /etc/alternatives/java /usr/lib/jvm/java-1.6.0/bin/java /usr/lib/jvm/jre-1.6.0/bin/java /usr/lib/jvm/java-1.5.0/bin/java /usr/lib/jvm/jre-1.5.0/bin/java /usr/bin/java /usr/java/jdk1.6.0_32/bin/java

启动服务，查看状态
9.     /etc/init.d/jenkins start
10.   /etc/init.d/jenkins status
jenkins (pid  11703) is running...