环境：
consul：consul_1.16.2_linux_amd64.zip centos7.9
server:192.168.50.154 192.168.50.155 192.168.50.156
client:192.168.70.64

安装目录：

[root@rabbit4-64 consul]# pwd
/app/consul
[root@rabbit4-64 consul]# ls
consul  consul_1.16.2_linux_amd64.zip  consul.json  data
[root@rabbit4-64 consul]# 

192.168.70.64 client

[root@rabbit4-64 consul]# cat consul.json 
{"datacenter": "ybjdc1","data_dir": "/app/consul/data","log_level": "INFO","node_name": "","server": false,"ui": true,"bootstrap_expect": 0,"bind_addr": "192.168.70.64","client_addr": "192.168.70.64","retry_join": ["192.168.50.154","192.168.50.155","192.168.50.156"],"retry_interval": "3s","raft_protocol": 3,"enable_debug": false,"rejoin_after_leave": true,"enable_syslog": false
}

192.168.50.154 server

[root@first-1 consul]# cat consul.json 
{"datacenter": "ybjdc1","data_dir": "/app/consul/data","log_level": "INFO","node_name": "","server": true,"ui": true,"bootstrap_expect": 2,"bind_addr": "192.168.50.154","client_addr": "192.168.50.154","advertise_addr": "192.168.50.154","retry_join": ["192.168.50.155","192.168.50.156"],"retry_interval": "3s","raft_protocol": 3,"enable_debug": false,"rejoin_after_leave": true,"enable_syslog": false
}

192.168.50.155 server

[root@second-2 consul]# cat consul.json 
{"datacenter": "ybjdc1","data_dir": "/app/consul/data","log_level": "INFO","node_name": "","server": true,"ui": true,"bootstrap_expect": 2,"bind_addr": "192.168.50.155","client_addr": "192.168.50.155","advertise_addr": "192.168.50.155","retry_join": ["192.168.50.154","192.168.50.156"],"retry_interval": "3s","raft_protocol": 3,"enable_debug": false,"rejoin_after_leave": true,"enable_syslog": false
}

192.168.50.156 server

[root@three-3 consul]# cat consul.json 
{"datacenter": "ybjdc1","data_dir": "/app/consul/data","log_level": "INFO","node_name": "","server": true,"ui": true,"bootstrap_expect": 2,"bind_addr": "192.168.50.156","client_addr": "192.168.50.156","advertise_addr": "192.168.50.156","retry_join": ["192.168.50.154","192.168.50.155"],"retry_interval": "3s","raft_protocol": 3,"enable_debug": false,"rejoin_after_leave": true,"enable_syslog": false
}

做成服务：

[root@rabbit4-64 consul]# cat /etc/systemd/system/consul.service 
[Unit]
Description=Consul agent server
Documentation=https://www.consul.io/
Requires=network-online.target
After=network-online.target
[Service]
EnvironmentFile=-/etc/sysconfig/consul
Environment=GOMAXPROCS=4
Restart=on-failure
#User=consul
LimitNOFILE=65536
ExecStart=/app/consul/consul agent -config-file /app/consul/consul.json
ExecReload=/bin/kill -HUP $MAINPID
KillSignal=SIGINT
[Install]
WantedBy=multi-user.target

访问测试：http://192.168.50.154:8500/ui/ybjdc1/services/consul/instances

启动注意点：
可以先使用/app/consul/consul agent -config-file /app/consul/consul.json命令启动，会出现以下错误，但是当全部启动后，就没有出现connect: connection refused的情况了

2024-03-26T11:26:03.758+0800 [ERROR] agent.server.raft: failed to appendEntries to: peer="{Voter 31e197d0-480a-018f-392c-9a81fce11f98 192.168.50.155:8300}" error=EOF
2024-03-26T11:26:03.821+0800 [ERROR] agent.server.raft: failed to appendEntries to: peer="{Voter 31e197d0-480a-018f-392c-9a81fce11f98 192.168.50.155:8300}" error="dial tcp 192.168.50.154:0->192.168.50.155:8300: connect: connection refused"
2024-03-26T11:26:03.888+0800 [ERROR] agent.server.raft: failed to appendEntries to: peer="{Voter 31e197d0-480a-018f-392c-9a81fce11f98 192.168.50.155:8300}" error="dial tcp 192.168.50.154:0->192.168.50.155:8300: connect: connection refused"