Julien Infra Hostinger Docker

ssh srv759970 'docker stats --no-stream --format "table {{.Name}}\t{{.MemUsage}}\t{{.CPUPerc}}"'

Logs

ssh srv759970 'docker logs container-name --tail 50'
ssh srv759970 'docker logs -f container-name'  # Follow
ssh srv759970 'docker logs container-name --tail 100 --timestamps'

2. Container Operations

Start/Stop/Restart

ssh srv759970 'docker restart container-name'
ssh srv759970 'docker stop container-name'
ssh srv759970 'docker start container-name'

Deploy Service

ssh srv759970 << 'EOF'
cd /opt/service-name
docker-compose down
docker-compose up -d
docker-compose logs --tail 20
EOF

Force Recreate (for config changes)

ssh srv759970 'cd /opt/service && docker-compose down && docker-compose up -d --force-recreate'

Execute Command in Container

ssh srv759970 'docker exec -it container-name bash'
ssh srv759970 'docker exec container-name ls /app'
ssh srv759970 'docker exec -u root container-name chown -R www-data:www-data /var/www/html'

3. WordPress Docker

Containers

Common Commands

# Status
ssh srv759970 'docker ps | grep wordpress'

# Logs
ssh srv759970 'docker logs wordpress-site --tail 50'

# Restart
ssh srv759970 'cd /opt/wordpress-site && docker-compose restart'

# WP-CLI
ssh srv759970 'docker exec wp-cli-site wp plugin list'
ssh srv759970 'docker exec wp-cli-site wp user list'

# Fix permissions
ssh srv759970 'docker exec -u root wordpress-site chown -R www-data:www-data /var/www/html'

4. Image Management

List Images

ssh srv759970 'docker images --format "table {{.Repository}}\t{{.Tag}}\t{{.Size}}"'

Cleanup

# Dangling images (safe)
ssh srv759970 'docker image prune -f'

# Old images (>30 days)
ssh srv759970 'docker image prune -a --filter "until=720h"'

# Unused volumes
ssh srv759970 'docker volume prune -f'

Build & Deploy

ssh srv759970 << 'EOF'
cd /opt/service
docker-compose build --no-cache
docker-compose up -d --force-recreate
docker image prune -f
EOF

5. Troubleshooting

ContainerConfig KeyError

docker-compose down && docker-compose up -d --force-recreate

Network has active endpoints

# Skip down, use only:
docker-compose up -d --force-recreate

Wrong CMD in container

docker-compose build --no-cache
docker-compose up -d

Container keeps restarting

# Check logs
docker logs container-name --tail 100

# Check exit code
docker inspect container-name | grep ExitCode

# Check memory limits
docker stats --no-stream container-name

Permission denied (scp)

Use cat with heredoc instead:

ssh srv759970 "cat > /opt/service/Dockerfile" << 'EOF'
# Dockerfile content here
EOF

6. Optimization

Multi-stage Dockerfile Template

# Stage 1: Build
FROM python:3.11-slim AS builder
WORKDIR /app
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# Stage 2: Runtime
FROM python:3.11-slim
WORKDIR /app
COPY --from=builder /usr/local/lib/python3.11/site-packages /usr/local/lib/python3.11/site-packages
COPY . .
EXPOSE 8000
CMD ["python", "main.py"]

Best Practices

1. Order layers: deps before code
2. Use multi-stage builds
3. Combine RUN commands
4. Add .dockerignore
5. Use --no-cache-dir for pip

Quick Reference

# Status
ssh srv759970 'docker ps && docker system df'

# Restart service
ssh srv759970 'cd /opt/service && docker-compose restart'

# Logs
ssh srv759970 'docker logs container --tail 50'

# Cleanup
ssh srv759970 'docker image prune -f && docker volume prune -f'

# Full redeploy
ssh srv759970 'cd /opt/service && docker-compose down && docker-compose build --no-cache && docker-compose up -d'