$ rpm -ivh http://mirrors.aliyun.com/zabbix/zabbix/5.0/rhel/7/x86_64/zabbix-release-5.0-1.el7.noarch.rpm
#如果安装慢可以替换国内源
$ sed -i 's#http://repo.zabbix.com#https://mirrors.aliyun.com/zabbix#' /etc/yum.repos.d/zabbix.repo
$ yum -y install zabbix-agent

$ rpm -ivh https://mirrors.tuna.tsinghua.edu.cn/zabbix/zabbix/5.0/rhel/7/x86_64/zabbix-agent-5.0.2-1.el7.x86_64.rpm
#注意自己系统版本

$ rpm -qa | grep zabbix
zabbix-agent-5.0.2-1.el7.x86_64

$ wget https://cdn.zabbix.com/zabbix/sources/stable/5.0/zabbix-5.0.2.tar.gz
$ tar xf zabbix-5.0.2.tar.gz
$ cd zabbix-5.0.2
$ yum -y install gcc gcc-c++ make pcre-devel
#安装依赖
$ groupadd --system zabbix
$ useradd --system -g zabbix -d /usr/local/zabbix-agent/ -s /sbin/nologin -c "Zabbix Monitoring System" zabbix
#创建 zabbix 用户，因为不允许 root 用户启动
$ ./configure --prefix=/usr/local/zabbix-agent --enable-agent
#生成 Makefile
$ make && make install
#编译安装

$ vim /usr/lib/systemd/system/zabbix-agent.service
[Unit]
Description=Zabbix Agent
After=syslog.target
After=network.target

[Service]
Environment="CONFFILE=/usr/local/zabbix-agent/etc/zabbix_agentd.conf"    #agent配置文件
EnvironmentFile=-/etc/sysconfig/zabbix-agent
Type=forking
Restart=on-failure
PIDFile=/tmp/zabbix_agentd.pid      #pid 文件需要 zabbix 有文件创建权限，不然启动会失败
KillMode=control-group
ExecStart=/usr/sbin/zabbix_agentd -c $CONFFILE
ExecStop=/bin/kill -SIGTERM $MAINPID
RestartSec=10s
User=zabbix
Group=zabbix

[Install]
WantedBy=multi-user.target

$ vim /etc/zabbix/zabbix_agentd.conf

Server=Server IP #被动模式
ServerActive=Server IP #主动模式
ListenPort=10050 #主动模式监听端口 10051
Hostname=Jblog

$ tail -1f /var/log/zabbix/zabbix_agentd.log
active check configuration update from [127.0.0.1:10051] started to fail (cannot connect to [[127.0.0.1]:10051]: [111] Connection refused)

$ vim /etc/zabbix/zabbix_agentd.conf

#注释掉ServerActive=127.0.0.1

$ systemctl restart zabbix-agent