could not translate host name "localhost:5432" to address

[babvin]

ben@debian:postgres-backup-container$ docker run -v /backup:/pg_backup babvin/postgres-back-up
Creating dump: backupOn2019-08-26-18-22.dump
pg_dumpall: could not connect to database "template1": could not translate host name "localhost:5432" to address: Name does not resolve Back up not created, check db connection settings
ben@debian:postgres-backup-container$

ben@debian:postgres-backup-container$ cat dumpDatabase.sh
DUMP_FILE_NAME="backupOndate +%Y-%m-%d-%H-%M.dump"
echo "Creating dump: $DUMP_FILE_NAME"

cd pg_backup

PGPASSWORD=password pg_dumpall -U postgres > $DUMP_FILE_NAME

if [ $? -ne 0 ]; then
rm $DUMP_FILE_NAME
echo "Back up not created, check db connection settings"
exit 1
fi

echo 'Successfully Backed Up'
exit 0
ben@debian:postgres-backup-container$

ben@debian:postgres-backup-container$ cat Dockerfile
FROM alpine:3.6

ENV PGHOST='localhost:5432'
#ENV PGHOST='192.168.99.101'
ENV POSTGRES_PORT=5432
ENV PGDATABASE='postgres'
ENV PGUSER='postgres@postgres'
ENV PGPASSWORD='password'

RUN apk update
RUN apk add postgresql

COPY dumpDatabase.sh .

ENTRYPOINT [ "/bin/sh" ]
CMD [ "./dumpDatabase.sh" ]
ben@debian:postgres-backup-container$

[luisg0nc]

Use PGHOST only for the hostname/ip and add PGPORT for the port.
Tested and it works.

[rinormaloku]

Solved with the #2 PR