Can't connect: Containerized Bitbucket -> Containerized Postgres (On CentOs Stream) - postgresql

Question

I am trying to containerize the Atlassian tool set (Jira, Bitbucket, Confluence, Bamboo) and back it with Postgresql.
I am a Docker newbie. Although I learned a lot today alone...
TLDR - I cannot get the Bitbucket wizard to accept the connection to Postgresql. I also do not have access to Kubernetes.
Note: I did use the --add-host=host.docker.internal:host.gateway to both containers. IS THIS A PROBLEM?!
I created and started the two necessary containers
​
$ sudo docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
bba43f9e9aa6 atlassian/bitbucket "/usr/bin/tini -- /e…" 50 minutes ago Up 50 minutes 0.0.0.0:7990->7990/tcp, :::7990->7990/tcp, 0.0.0.0:7999->7999/tcp, :::7999->7999/tcp bitbucket-docker
050df8a05cce postgres "docker-entrypoint.s…" 54 minutes ago Up 54 minutes 0.0.0.0:5432->5432/tcp, :::5432->5432/tcp postgres-docker
I created a docker network and connected both containers to it
​
[erik#localhost volumes]$ sudo docker network inspect atlassian-network
[
{
"Name": "atlassian-network",
"Id": "eb45fe5a08280ea0aacb9ee107edf26b9df690398d8e7e0db2d188662120d69a",
"Created": "2022-05-13T12:31:30.417700947-04:00",
"Scope": "local",
"Driver": "bridge",
"EnableIPv6": false,
"IPAM": {
"Driver": "default",
"Options": {},
"Config": [
{
"Subnet": "172.18.0.0/16",
"Gateway": "172.18.0.1"
}
]
},
"Internal": false,
"Attachable": false,
"Ingress": false,
"ConfigFrom": {
"Network": ""
},
"ConfigOnly": false,
"Containers": {
"050df8a05cce53044cba9ab9b2aab80088c264228fc9e357077d60209db59e02": {
"Name": "postgres-docker",
"EndpointID": "1250dd25a1dc39faf9f56d2cb70b0b21922068840097c17c213b944b3d1e952b",
"MacAddress": "02:42:ac:12:00:02",
"IPv4Address": "172.18.0.2/16",
"IPv6Address": ""
},
"bba43f9e9aa6e677eb970734a2d16e955ceeff2f0e2ae328f50d377f74cd6a53": {
"Name": "bitbucket-docker",
"EndpointID": "ddcb259a4f5f217f144aa09fb99f059e9000a0c7afdcf8c2f0f4979479f7a5c4",
"MacAddress": "02:42:ac:12:00:03",
"IPv4Address": "172.18.0.3/16",
"IPv6Address": ""
}
},
"Options": {},
"Labels": {}
}
]
I used the postgres client to test the connection from the Bitbucket container(bba) to the Postgres container(050)
​
root#bba43f9e9aa6:/var/atlassian/application-data/bitbucket# pg_isready -d bitbucket -h postgres-docker -p 5432 -U atlassian_user
postgres-docker:5432 - accepting connections
**************************************
The Bitbucket wizard (on 172.18.0.3:7990)
The configuration entered is not valid. A database connection could not be established. Please check your configuration and try again.
**************************************
​
Database -> ExternalType -> PostgreSQLHost-> postgres-dockerPort-> 5432DB Name -> bitbucketDB User -> atlassian_userDB Pass -> pass
​
Some more debugging...
​
root#050df8a05cce:/# psql bitbucket -U atlassian_user
psql (14.2 (Debian 14.2-1.pgdg110+1))
Type "help" for help.
bitbucket=# \conninfo
You are connected to database "bitbucket" as user "atlassian_user" via socket in "/var/run/postgresql" at port "5432".
root#050df8a05cce:/# ping bitbucket-docker
PING bitbucket-docker (172.18.0.3) 56(84) bytes of data.
64 bytes from bitbucket-docker.atlassian-network (172.18.0.3): icmp_seq=1 ttl=64 time=0.519 ms
64 bytes from bitbucket-docker.atlassian-network (172.18.0.3): icmp_seq=2 ttl=64 time=0.188 ms
64 bytes from bitbucket-docker.atlassian-network (172.18.0.3): icmp_seq=3 ttl=64 time=0.267 ms
$ sudo docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
bba43f9e9aa6 atlassian/bitbucket "/usr/bin/tini -- /e…" About an hour ago Up About an hour 0.0.0.0:7990->7990/tcp, :::7990->7990/tcp, 0.0.0.0:7999->7999/tcp, :::7999->7999/tcp bitbucket-docker
050df8a05cce postgres "docker-entrypoint.s…" About an hour ago Up About an hour 0.0.0.0:5432->5432/tcp, :::5432->5432/tcp postgres-docker