podman: create a pod with a node simple application through nginx web server

pdm-n.md

dependencies

su
apt-get install podman golang-github-containernetworking-plugin-dnsname
cd /usr/lib/podman
wget https://github.com/containers/gvisor-tap-vsock/releases/download/v0.7.1/gvproxy-linux-amd64
mv gvproxy-linux-amd64 gvproxy
chmod +x gvproxy
exit

nginx

1. create folder and edit config:

mkdir -p /home/projects/pdm-nginx
cd /home/projects/pdm-nginx
nano nginx.conf

nginx.conf

events {}

http {
    server {
        listen 80;
        server_name localhost;

        location / {
            proxy_pass http://pdm-node-instance:8080;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection 'upgrade';
            proxy_set_header Host $host;
            proxy_cache_bypass $http_upgrade;
        }
    }
}

2. create Dockerfile file

nano Dockerfile

# nginx-config/Dockerfile
FROM nginx:latest

COPY nginx.conf /etc/nginx/nginx.conf

3. build image

podman build -t pdm-nginx .

node

1. create folder and edit config

mkdir -p /home/projects/pdm-node
cd /home/projects/pdm-node
nano index.js

2. create index.js file

const http = require('http');

const server = http.createServer((req, res) => {
  res.writeHead(200, { 'Content-Type': 'text/html' });
  res.end('Hello, podman');
});

const port = 8080;

server.listen(port, () => {
  console.log(`Server running at http://localhost:${port}/`);
});

3. create Dockerfile file

nano Dockerfile

# node-app/Dockerfile
FROM node:18

WORKDIR /app

#COPY package*.json ./
#RUN npm install

COPY index.js .

EXPOSE 8080

CMD ["node", "index.js"]

3. build image

podman build -t pdm-node .

pod

1. create pod

podman pod create --name pdm-n -p 8080:80

2. create node instance and insert into the pod

podman run -d --pod pdm-n --name pdm-node-instance pdm-node

3. create nginx instance and insert into the pod

podman run -d --pod pdm-n --name pdm-nginx-instance pdm-nginx

4. restart pod

podman pod stop pdm-n
podman pod start pdm-n

check the url

curl http://localhost:8080

Result:

curl: (56) Recv failure: Connection reset by peer

Error

• Show container list

podman ps --pod

• if some containers are missing:

podman ps --pod -a

• We can see

878f7bb9e056  localhost/pdm-nginx:latest      nginx -g daemon o...  About a minute ago  Exited (1) 43 seconds ago  0.0.0.0:8080->80/tcp  pdm-nginx-instance  f4d6d3870d55  pdm-n

• check logs

podman logs 878f7bb9e056

/docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration
/docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/
/docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh
10-listen-on-ipv6-by-default.sh: info: Getting the checksum of /etc/nginx/conf.d/default.conf
10-listen-on-ipv6-by-default.sh: info: Enabled listen on IPv6 in /etc/nginx/conf.d/default.conf
/docker-entrypoint.sh: Sourcing /docker-entrypoint.d/15-local-resolvers.envsh
/docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh
/docker-entrypoint.sh: Launching /docker-entrypoint.d/30-tune-worker-processes.sh
/docker-entrypoint.sh: Configuration complete; ready for start up
/docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration
/docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/
/docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh
10-listen-on-ipv6-by-default.sh: info: IPv6 listen already enabled
/docker-entrypoint.sh: Sourcing /docker-entrypoint.d/15-local-resolvers.envsh
/docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh
/docker-entrypoint.sh: Launching /docker-entrypoint.d/30-tune-worker-processes.sh
/docker-entrypoint.sh: Configuration complete; ready for start up
2024/01/12 10:56:00 [emerg] 1#1: host not found in upstream "pdm-node-instance" in /etc/nginx/nginx.conf:9
nginx: [emerg] host not found in upstream "pdm-node-instance" in /etc/nginx/nginx.conf:9

• for some reason can't reach the node instance

• remove the container from the pod

podman rm pdm-nginx-instance

• list all containers and pods

podman ps --pod -a

• try to add the nginx instance to pod

podman run -d --pod pdm-n --name pdm-nginx-instance pdm-nginx

• restart pod

podman pod stop pdm-n
podman pod start pdm-n

• I think it was better to create the node image first, because the nginx calls to node instance, but it had not been created yet

• check the url

curl http://localhost:8080

Result:

Hello, podman