systemd 介绍
systemd是目前Linux系统上主要的系统守护进程管理工具,由于init一方面对于进程的管理是串行化的,容易出现阻塞情况,另一方面init也仅仅是执行启动脚本,并不能对服务本身进行更多的管理。所以从CentOS 7开始也由systemd取代了init作为默认的系统进程管理工具。
systemd所管理的所有系统资源都称作Unit,通过systemd命令集可以方便的对这些Unit进行管理。比如systemctl、hostnamectl、timedatectl、localctl等命令,这些命令虽然改写了init时代用户的命令使用习惯(不再使用chkconfig、service等命令),但确实也提供了很大的便捷性。
systemctl [command] [unit](配置的应用名称)
· start:启动指定的unit systemctl start nginx
· stop:关闭指定的unit systemctl stop nginx
· restart:重启指定unit systemctl restart nginx
· reload:重载指定unit systemctl reload nginx
· enable:系统开机时自动启动指定unit,前提是配置文件中有相关配置 systemctl enable nginx
· disable:开机时不自动运行指定unit systemctl disable nginx
· status:查看指定unit当前运行状态 systemctl status nginx
yum -y install gcc gcc-c++ openssl-devel pcre-devel gd-devel iproute net-tools telnet wget curl
wget http://nginx.org/download/nginx-1.15.5.tar.gz
tar zxf nginx-1.15.5.tar.gz &&
cd nginx-1.15.5
./configure --prefix=/usr/local/nginx \
--with-http_ssl_module \
--with-http_stub_status_module
make -j 4 && make install
/usr/local/nginx/sbin/nginx #启动
/usr/local/nginx/sbin/nginx -s reload #重启
/usr/local/nginx/sbin/nginx -s quit #关闭nginx
vim /usr/lib/systemd/system/nginx.service
[Unit]
Description=nginx
After=network.target
[Service]
Type=forking
ExecStart=/usr/local/nginx/sbin/nginx
ExecReload=/usr/local/nginx/sbin/nginx -s reload
ExecStop=/usr/local/nginx/sbin/nginx -s quit
PrivateTmp=true
[Install]
WantedBy=multi-user.target
systemctl restart nginx
systemctl enable nginx
systemctl stop nginx
wget 120.78.77.38/file/jdk-8u231-linux-x64.rpm
wget 120.78.77.38/file/apache-tomcat-9.0.27.tar.gz
rpm -ivh jdk-8u231-linux-x64.rpm #rpm直接安装jdk
vim /etc/profile
export JAVA_HOME=/usr/java/jdk1.8.0_231-amd64
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export JAVA_PATH=${JAVA_HOME}/bin:${JRE_HOME}/bin
export PATH=${JAVA_HOME}/bin:$PATH
source /etc/profile
java -version #检测环境
tar -xf apache-tomcat-9.0.27
mv apache-tomcat-9.0.27 /usr/local/tomcat
sh /usr/local/tomcat/bin/startup.sh #启动
sh /usr/local/tomcat/bin/shutdown.sh #关闭
vim /usr/lib/systemd/system/tomcat.service
[Unit]
Description=tomcat server
Wants=network-online.target
After=network.target
[Service]
Type=forking
Environment="JAVA_HOME=/usr/java/jdk1.8.0_231-amd64"
Environment="PATH=$JAVA_HOME/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin"
Environment="CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar"
ExecStart=/usr/local/tomcat/bin/startup.sh
ExecStop=/usr/local/tomcat/bin/shutdown.sh
Restart=on-failure
[Install]
WantedBy=multi-user.target
systemctl restart tomcat #启动
systemctl enable tomcat #配置自启
systemctl stop tomcat #停止服务
systemctl status tomcat #检测状态
以上两个实战nginx和tomcat程序中自带了启动停止脚本,如果启动得程序没有自带脚本则需要自己编写一个类似得启动停止脚本。
实际得项目中会有一些jar程序需要启动 如果手动启动则需要输入一大串命令停止则需要杀掉进程来停止,很麻烦。
java -jar decode.jar -Dconfig=/usr/local/abc/application.properties
vim demo.sh
#!/bin/bash
#
source /etc/profile
jarName="abc-web.jar"
workDir="/usr/local/abc"
start(){
cd ${workDir} && java -jar ${jarName} --spring.profiles.active=prod --server.port=9630 >uams.log 2>&1 &
}
stop(){
ps -ef | grep -qP "(?<=-jar)\s+${jarName}" && kill $(ps -ef | grep -P "(?<=-jar)\s+${jarName}" | awk '{print $2}')
}
case $1 in
start)
start
;;
stop)
stop
;;
restart)
stop
start
;;
esac
vim /usr/lib/systemd/system/abc.service
[Unit]
Description=uams server
Wants=network-online.target
After=network.target
[Service]
Type=forking
WorkingDirectory=/usr/local/abc/
ExecStart=/bin/bash uams.sh start
ExecStop=/bin/bash uams.sh stop
ExecReload=/bin/bash uams.sh restart
Restart=on-failure
[Install]
WantedBy=multi-user.target
systemctl restart abc #启动
systemctl enable abc #配置自启
systemctl stop abc #停止服务
systemctl status abc #检测状态
来源:blog.csdn.net/weixin_43546282/ article/details/113761180