docker - mosquitto subscribe to test broker: Host is unreachable

Question

My project running in the docker container, I enter the container ping IP network is normal,

bash-5.0# ping 172.25.216.186
PING 172.25.216.186 (172.25.216.186): 56 data bytes
64 bytes from 172.25.216.186: seq=0 ttl=64 time=0.099 ms
64 bytes from 172.25.216.186: seq=1 ttl=64 time=0.110 ms

But use mosquitto_sub command to show the Host is unreachable.

bash-5.0# apk add mosquitto-clients
fetch http://mirrors.tuna.tsinghua.edu.cn/alpine/v3.10/main/x86_64/APKINDEX.tar.gz
fetch http://mirrors.tuna.tsinghua.edu.cn/alpine/v3.10/community/x86_64/APKINDEX.tar.gz
(1/3) Installing c-ares (1.15.0-r0)
(2/3) Installing mosquitto-libs (1.6.3-r0)
(3/3) Installing mosquitto-clients (1.6.3-r0)
Executing busybox-1.30.1-r2.trigger
OK: 266 MiB in 84 packages
bash-5.0# mosquitto_sub -h 172.25.216.186 -p 1883 -t test -d
Error: Host is unreachable

Strangely enough, I work fine on the host

(base) root@test:~# mosquitto_sub -h 172.25.216.186 -p 1883 -t edge -d
Client mosq-3xlIdUyrnEWBSy8qnL sending CONNECT
Client mosq-3xlIdUyrnEWBSy8qnL received CONNACK (0)
Client mosq-3xlIdUyrnEWBSy8qnL sending SUBSCRIBE (Mid: 1, Topic: edge, QoS: 0, Options: 0x00)
Client mosq-3xlIdUyrnEWBSy8qnL received SUBACK
Subscribed (mid: 1): 0

Intranet IP is obtained as follows

ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:16:3e:01:d9:82 brd ff:ff:ff:ff:ff:ff
    inet 172.25.216.186/20 brd 172.25.223.255 scope global dynamic eth0
       valid_lft 315066103sec preferred_lft 315066103sec
    inet6 fe80::216:3eff:fe01:d982/64 scope link
       valid_lft forever preferred_lft forever

I don't know what caused this mistake, I hope someone can help me, thank you.

question from:https://stackoverflow.com/questions/66065244/mosquitto-subscribe-to-test-broker-host-is-unreachable

Answer 1

Waitting for answers