Linux环境变量从用户配置改为系统配置

　　部署了一个新的tomcat到一个新的用户下，发下启动失败了

/home/personal/apache-tomcat/bin/catalina.sh: line 434: /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.102-4.b14.el7.x86_64/jre/bin/java: No such file or directory

　　这里日志说启动时找java虚拟机时没找到，去看了下，果然不对

[personal@ZJHZ-CMREAD-TEST126 /]$ cd usr/lib/jvm
[personal@ZJHZ-CMREAD-TEST126 jvm]$ ll
total 0
drwxr-xr-x 3 root root 16 Mar 17 08:46 java-1.7.0-openjdk-1.7.0.111-2.6.7.2.el7_2.x86_64

　　换个好的环境看了下环境变量，JAVA_HOME是/usr/jdk1.8.0_102，接着去系统变量 etc/profile里看

JAVA_HOME=/usr/jdk1.8.0_102
JAVA_BIN=/usr/jdk1.8.0_102/bin
ANT_HOME=/home/cmreadwh/apache-ant-1.10.1
PATH=$JAVA_HOME/bin:$ANT_HOME/bin:$PATH
CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

　　很明显其他用户直接读取了系统配置的环境变量，那么我们来比较下两个用户之间环境变量配置的.bashrc文件内容的区别：

好的

# .bashrc

# Source global definitions
if [ -f /etc/bashrc ]; then
        . /etc/bashrc
fi

# Uncomment the following line if you don't like systemctl's auto-paging feature:
# export SYSTEMD_PAGER=

# User specific aliases and functions

有问题的

# .bashrc

# Source global definitions
if [ -f /etc/bashrc ]; then
        . /etc/bashrc
fi

# Uncomment the following line if you don't like systemctl's auto-paging feature:
# export SYSTEMD_PAGER=

# User specific aliases and functions

source ~/apache-tomcat/cfg/cshrc

　　最后一行覆盖了前面的环境变量设置，我们来看看apache-tomcat/cfg/cshrc就知道了

export JAVA_HOME="/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.102-4.b14.el7.x86_64"
export CATALINA_TMPDIR="/tmp"
export JAVA_BINDIR="${JAVA_HOME}/bin"
export JDK_HOME="${JAVA_HOME}"
export SDK_HOME="${JAVA_HOME}"
export PATH="${JAVA_HOME}/bin:${HOME}/bin:/usr/local/bin:/usr/bin:/usr/X11R6/bin:/bin:/usr/games:/opt/gnome/bin:/opt/kde3/bin:$PATH"
export JAVA_ROOT="${JAVA_HOME}"
export JRE_HOME="${JAVA_HOME}/jre"
export CATALINA_HOME="${HOME}/apache-tomcat"
export CLASSPATH=".:${JAVA_HOME}/lib/jt.jar:${JAVA_HOME}/lib/tools.jar:${JAVA_HOME}/jre/lib:${CATALINA_HOME}/webapps/ues/WEB-INF/classes"

#setenv LC_ALL zh_CN.GBK

alias cfg="cd ${CATALINA_HOME}/cfg"
alias webapps="cd ${CATALINA_HOME}/webapps"
alias class="cd ${CATALINA_HOME}/webapps/ROOT/WEB-INF/classes"
alias tlog="cd  ${CATALINA_HOME}/logs"
alias logs="cd ${CATALINA_HOME}/logs"
alias local="cd ${CATALINA_HOME}/local"
alias catlog="tail -f ${CATALINA_HOME}/logs/catalina.out"
alias version="java Version"
alias start="${CATALINA_HOME}/cfg/iread.sh start"
alias stop="${CATALINA_HOME}/cfg/iread.sh stop"
alias restart="${CATALINA_HOME}/cfg/iread.sh restart"
alias status="${CATALINA_HOME}/cfg/iread.sh status"

　　为了使用系统环境变量，只要把有问题的用户里.bashrc文件的最后一行注掉就可以了，切记为了使新环境变量生效需要重新source一下

source ~/.bashrc