Hostname not found, but the container is on the same network.

[yakkobr]

I have several containers, the backup is on the same network, but when trying to call the PostgreSQL host, I get an "unreachable hostname" error.

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Console log warning:

2026-06-01.13:47:44 [WARN] ** [01-svcwiki-banco__wiki] Postgres Host 'wiki-banco' is not accessible, retrying.. (10 seconds so far)
sudo: pg_isready: command not found

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Connect console container and this results:

[tiredofit/db-backup:4.1.99 13:48:50 /] $ ping wiki-banco
PING wiki-banco (10.0.4.247) 56(84) bytes of data.
64 bytes from 10.0.4.247: icmp_seq=1 ttl=64 time=0.608 ms
64 bytes from 10.0.4.247: icmp_seq=2 ttl=64 time=0.324 ms
64 bytes from 10.0.4.247: icmp_seq=3 ttl=64 time=0.133 ms
64 bytes from 10.0.4.247: icmp_seq=4 ttl=64 time=0.243 ms
64 bytes from 10.0.4.247: icmp_seq=5 ttl=64 time=0.162 ms
^C
--- wiki-banco ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4102ms
rtt min/avg/max/mdev = 0.133/0.294/0.608/0.170 ms

[mplogas]

I am experiencing the same issue. it seems no postgres tools are installed in :latest

user@server:~# sudo docker exec -it db-backup /bin/bash
[tiredofit/db-backup:4.1.99 09:51:32 /] $ find / -name pg_isready
[tiredofit/db-backup:4.1.99 09:51:54 /] $ find / -name pg_dump
[tiredofit/db-backup:4.1.99 09:52:02 /] $ find / -name pg_dumpall
[tiredofit/db-backup:4.1.99 09:52:07 /] $ find / -name psql
[tiredofit/db-backup:4.1.99 09:52:15 /] $

However, read the changelog. Here's what I found.

• 4.1.99 (2026-03-12): "Postgresql 18 support" added, and it's flagged as "the final tiredofit/db-backup release. All development moves to nfrastack/container-db-backup."
• 4.1.100 (2026-03-13): "Repush of 4.1.99." this is where :latest points to, but has the same issues

It seems like the pg18 changes broke something.
If you're still on pg17 it's worth going back to 4.1.21, it has all required tools:

user@server:~# docker pull ghcr.io/tiredofit/docker-db-backup:4.1.21
4.1.21: Pulling from tiredofit/docker-db-backup
[...]
user@server:~# docker run --rm --entrypoint sh ghcr.io/tiredofit/docker-db-backup:4.1.21 -lc \
    'command -v pg_isready pg_dump psql && pg_dump --version'
/usr/bin/pg_isready
pg_dump (PostgreSQL) 17.5