本人装的是 Docker 版 zabbix 5.4.1，zabbix 服务器IP是 192.168.X.A ，在容器可以 ping 得通这个IP，在客户端填写 192.168.X.A ，即 /etc/zabbix/zabbix_agentd.conf 里面的 server=192.168.X.A ，是这样填写，不过就是会报 Get value from agent failed: Cannot connect to [[192.168.X.A:10050]: [111] Connection refused

后来百度了好久，终于知道是怎么回事，因为Docker容器安装的 zabbix-server-mysql 自己就有一个IP，而 /etc/zabbix/zabbix_agentd.conf 里面的 server= 本来就是需要填写服务器本来的IP，而不是容器属主机的IP，接下来，如何找这IP呢？ 

docker network ls
NETWORK ID          NAME                DRIVER              SCOPE
067485fae952        bridge              bridge              local
908a10c1d8d8        gitlab_default      bridge              local
40fb91a8dfe9        host                host                local
2282753d6061        none                null                local

#查询brideg的详细信息
docker inspect 067485fae952

        "Containers": {
            "090c52f4a5afe04bfda8317230febf3d5f573b0bb409a76b9515e5e7330ede07": {
                "Name": "zabbix-mysql",
                "EndpointID": "410d3552da07871a1064097eb173a2167a62817d58b084c1bb2d7ac7d45bb5cd",
                "MacAddress": "02:42:ac:11:00:03",
                "IPv4Address": "172.17.0.3/16",
                "IPv6Address": ""
            },
            "5f34c6f2bcdee6565ba901a2cb03ed699fec504b28888855dcfe7b5a28f9283e": {
                "Name": "zabbix-web-nginx-mysql",
                "EndpointID": "4ea5efdccc43fe2a9249c8553fe864f0db2f15ec94848c7949dd8a4e23a408a7",
                "MacAddress": "02:42:ac:11:00:05",
                "IPv4Address": "172.17.0.5/16",
                "IPv6Address": ""
            },
            "df91c2082aa38763b80c730b1469ce43b4c198379796c13d9da9df86d9150c1e": {
                "Name": "zabbix-server-mysql",
                "EndpointID": "759e34f40f84cdff4c6cdafcbfa00434bcf651d4fc9b13b2d83f00780abcd5c0",
                "MacAddress": "02:42:ac:11:00:04",
                "IPv4Address": "172.17.0.4/16",
                "IPv6Address": ""
            },

可以看到，zabbix-server-mysql 对应的 IP 是：172.17.0.4 ，把这个 IP 放进 /etc/zabbix/zabbix_agentd.conf  >  server=192.168.X.A,172.17.0.4

systemctl restart zabbix-agent

重启zabbix-agent 后，等一分钟左右，本来红的 ZBX 字样，就会变成绿的了