I have a Python docker container that needs to wait until another container (postgres server) finishes setup. I tried the standard wait-for-it.sh but several commands weren't included. I tried a basic sleep (again in an sh file) but now it's reporting exec: 300: not found when trying to finally execute the command I'm waiting on.
How do I get around this (preferably without changing the image, or having to extend an image.)
I know I could also just run a Python script, but ideally I'd like to use wait-for-it.sh to wait for the server to turn up rather than just sleep.
Dockerfile (for stuffer):
FROM python:2.7.13
ADD ./stuff/bin /usr/local/bin/
ADD ./stuff /usr/local/stuff
WORKDIR /usr/local/bin
COPY requirements.txt /opt/updater/requirements.txt
COPY internal_requirements.txt /opt/stuff/internal_requirements.txt
RUN pip install -r /opt/stuff/requirements.txt
RUN pip install -r /opt/stuff/other_requirements.txt
docker-compose.yml:
version: '3'
services:
local_db:
build: ./local_db
ports:
- "localhost:5432:5432"
stuffer:
build: ./
depends_on:
- local_db
command: ["./wait-for-postgres.sh", "-t", "300", "localhost:5432", "--", "python", "./stuffing.py", "--file", "./afile"]
Script I want to use (but can't because no psql or exec):
#!/bin/bash
# wait-for-postgres.sh
set -e
host="$1"
shift
cmd="$@"
until psql -h "$host" -U "postgres" -c '\l'; do >&2 echo "Postgres is unavailable - sleeping"
sleep 1
done
>&2 echo "Postgres is up - executing command"
exec $cmd
Sergey's comment. I had wrong argument order. This issue had nothing to do with docker and everything to do with my inability to read.