docker-compose.yaml:
version: '3.3'
services:
nginx:
image: nginx:latest
ports:
- 8080:80
With regards to the preceding docker-compose file, we have the term services that refers to all the applications that we would be running in one go. In this first example test, we can attempt to run the nginx container image under the service called nginx.
We can also set it such that we would export port 80 of the nginx container to our current workstation’s port 8080.
zzh@ZZHPC:/zdata/MyPrograms/Go/aaa$ docker compose -f docker-compose.yaml up [+] Running 2/1 ✔ Network aaa_default Created 0.1s ✔ Container aaa-nginx-1 Created 0.0s Attaching to aaa-nginx-1 aaa-nginx-1 | /docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration aaa-nginx-1 | /docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/ aaa-nginx-1 | /docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh aaa-nginx-1 | 10-listen-on-ipv6-by-default.sh: info: Getting the checksum of /etc/nginx/conf.d/default.conf aaa-nginx-1 | 10-listen-on-ipv6-by-default.sh: info: Enabled listen on IPv6 in /etc/nginx/conf.d/default.conf aaa-nginx-1 | /docker-entrypoint.sh: Sourcing /docker-entrypoint.d/15-local-resolvers.envsh aaa-nginx-1 | /docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh aaa-nginx-1 | /docker-entrypoint.sh: Launching /docker-entrypoint.d/30-tune-worker-processes.sh aaa-nginx-1 | /docker-entrypoint.sh: Configuration complete; ready for start up aaa-nginx-1 | 2023/09/25 03:15:50 [notice] 1#1: using the "epoll" event method aaa-nginx-1 | 2023/09/25 03:15:50 [notice] 1#1: nginx/1.25.2 aaa-nginx-1 | 2023/09/25 03:15:50 [notice] 1#1: built by gcc 12.2.0 (Debian 12.2.0-14) aaa-nginx-1 | 2023/09/25 03:15:50 [notice] 1#1: OS: Linux 6.2.0-33-generic aaa-nginx-1 | 2023/09/25 03:15:50 [notice] 1#1: getrlimit(RLIMIT_NOFILE): 1048576:1048576 aaa-nginx-1 | 2023/09/25 03:15:50 [notice] 1#1: start worker processes aaa-nginx-1 | 2023/09/25 03:15:50 [notice] 1#1: start worker process 29 aaa-nginx-1 | 2023/09/25 03:15:50 [notice] 1#1: start worker process 30 aaa-nginx-1 | 2023/09/25 03:15:50 [notice] 1#1: start worker process 31 aaa-nginx-1 | 2023/09/25 03:15:50 [notice] 1#1: start worker process 32 aaa-nginx-1 | 2023/09/25 03:15:50 [notice] 1#1: start worker process 33 aaa-nginx-1 | 2023/09/25 03:15:50 [notice] 1#1: start worker process 34 ^CGracefully stopping... (press Ctrl+C again to force) Aborting on container exit... [+] Stopping 1/1 ✔ Container aaa-nginx-1 Stopped 0.4s canceled
We can stop running the nginx application via docker-compose by doing a keyboard interrupt. However, the application would still be around (although stopped), and we will probably be unable to rerun the command: docker-compose -f docker-compose.yaml up once more without any issue. To properly clean up, we can run the following command:
zzh@ZZHPC:/zdata/MyPrograms/Go/aaa$ docker compose -f docker-compose.yaml down [+] Running 2/2 ✔ Container aaa-nginx-1 Removed 0.0s ✔ Network aaa_default Removed
docker-compose.yaml:
version: '3.3'
services:
app:
build:
context: .
dockerfile: dockerfile
ports:
- 8080:8080
When we use build here, it serves as some sort of indication to docker-compose that the image for this service might require us to run a Docker container build process to generate it.
zzh@ZZHPC:/zdata/MyPrograms/Go/aaa$ docker compose -f docker-compose.yaml up -d [+] Building 9.2s (12/12) FINISHED docker:default => [app internal] load .dockerignore 0.0s => => transferring context: 2B 0.0s => [app internal] load build definition from Dockerfile 0.0s => => transferring dockerfile: 214B 0.0s => [app internal] load metadata for docker.io/library/golang:1.21 2.8s => [app 1/7] FROM docker.io/library/golang:1.21@sha256:c416ceeec1cdf037b80baef1ccb402c230ab83a9134b34c0902c542eb4539c82 0.0s => [app internal] load build context 0.0s => => transferring context: 459B 0.0s => CACHED [app 2/7] WORKDIR /app 0.0s => CACHED [app 3/7] ADD go.mod go.sum ./ 0.0s => CACHED [app 4/7] RUN go env -w GOPROXY=https://goproxy.io,direct 0.0s => CACHED [app 5/7] RUN go mod download 0.0s => [app 6/7] ADD . . 0.0s => [app 7/7] RUN go build -o app . 6.1s => [app] exporting to image 0.3s => => exporting layers 0.3s => => writing image sha256:c5ca78c1b68074e5e4031f248a133252105b44ba94a62d45497a9a7fe7348b1d 0.0s => => naming to docker.io/library/aaa-app 0.0s [+] Running 2/2 ✔ Network aaa_default Created 0.1s ✔ Container aaa-app-1 Started
zzh@ZZHPC:/zdata/MyPrograms/Go/aaa$ docker compose logs aaa-app-1 | 2023/09/25 03:28:10 Hello world sample started.
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