ElasticSearch IPv6

Elastic Stack Elasticsearch
1

I installed Elasticsearch 9.2.0 on Ubuntu VN hosted on Oracle OCI cloud. But I cannot connect outside. After listening the listening ports on the VM I see this:

sudo netstat -ntlp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 692/sshd: /usr/sbin
tcp 0 0 127.0.0.53:53 0.0.0.0:* LISTEN 601/systemd-resolve
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 1/init
tcp6 0 0 :::22 :::* LISTEN 692/sshd: /usr/sbin
tcp6 0 0 :::111 :::* LISTEN 1/init
tcp6 0 0 10.0.0.12:9300 :::* LISTEN 1040/java
tcp6 0 0 :::9200 :::* LISTEN 1040/java

As you can see Elasticsearch by default is not listening on IPv4 port. I disabled on the VM IPv6 but still it’s not working. Can you recommend some solution?

2

Somewhat confusingly tcp6 refers to the mixed IPv4 and IPv6 stack, as you can see from this line which has an IPv4 address:

tcp6 0 0 10.0.0.12:9300 :::* LISTEN 1040/java

This line means it’s listening on all interfaces:

tcp6 0 0 :::9200 :::* LISTEN 1040/java

Please read these docs carefully for further information, noting in particular:

It is usually a mistake to use 0.0.0.0 as a publish address on hosts with more than one network interface.