在另一个容器docker中执行另一个容器命令

Question

I have 2 containers: a Redis container and a container for a Golang application. My Golang application is trying to perform Redis Mass Insertion (https://redis.io/topics/mass-insert) by executing a bash script with the command cat ${FILE}| redis-cli --pipe -h ${HOST}.

However, redis-cli is not found within the PATH system variable and it is not a built-in shell command in the Golang application service.

Hence, I get an exit status 127, which means the given command in not found. I would like to know how I would be able to execute the bash script without redis-cli command in the Golang application service.

Answer 1

It is possible to run the command from within the application container only if you rebuild your go application image and install the redis cli tools. Example using an ubuntu based image (add this to your Dockerfile): RUN apt update; apt -y install redis-tools If you are using docker compose, you can talk to your redis server using the name specified in your docker compose file.

cat ${FILE}| redis-cli --pipe -h redis-server

Assuming you name your redis container as shown in this sample

version: '3'
services:
  redis-server:
    image: xxx
[...]

Alternatively, if you want to run the command from the host server, you'll have to make sure you are forwarding the redis port from the redis container, then you can use:

docker exec {containerId} 'cat {FILE}' | redis-cli --pipe -h localhost:{REDIS_CONTAINER_PORT}`