Đôi khi Bash script tốt hơn Ansible

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#!/usr/bin/env bash
# ==============================================================================
# deploy.sh — Deploy application via Bash
# ==============================================================================

set -euo pipefail

readonly APP_NAME="myapp"
readonly DEPLOY_DIR="/opt/${APP_NAME}"
readonly SERVICE_NAME="${APP_NAME}.service"
readonly SERVERS=("web-01" "web-02" "web-03")
readonly SSH_KEY="${HOME}/.ssh/deploy_key"

log() { echo "[$(date '+%H:%M:%S')] $1"; }

deploy_server() {
    local server="$1"
    log "Deploying to ${server}..."

    # Pull code
    ssh -i "$SSH_KEY" "deploy@${server}" \
        "cd ${DEPLOY_DIR} && git pull origin main"

    # Restart service
    ssh -i "$SSH_KEY" "deploy@${server}" \
        "sudo systemctl restart ${SERVICE_NAME}"

    # Health check
    local status
    status=$(ssh -i "$SSH_KEY" "deploy@${server}" \
        "curl -s -o /dev/null -w '%{http_code}' http://localhost:8080/health")

    if [[ "$status" == "200" ]]; then
        log "${server}: OK"
    else
        log "${server}: FAILED (status: ${status})"
        return 1
    fi
}

# Deploy parallel (max 3)
for server in "${SERVERS[@]}"; do
    deploy_server "$server" &
    # Limit concurrent deployments
    while (( $(jobs -r | wc -l) >= 3 )); do
        sleep 0.5
    done
done

wait
log "Deployment completed"

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# deploy.yml
---
- name: Deploy application
  hosts: webservers
  become: yes
  vars:
    app_name: myapp
    deploy_dir: /opt/myapp
    service_name: myapp.service

  tasks:
    - name: Pull latest code
      git:
        repo: "https://github.com/org/myapp.git"
        dest: "{{ deploy_dir }}"
        version: main
      notify: Restart service

    - name: Ensure service is running
      systemd:
        name: "{{ service_name }}"
        state: started
        enabled: yes

    - name: Wait for health check
      uri:
        url: "http://localhost:8080/health"
        status_code: 200
      retries: 10
      delay: 5

  handlers:
    - name: Restart service
      systemd:
        name: "{{ service_name }}"
        state: restarted

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# Chạy playbook
ansible-playbook -i inventory/hosts deploy.yml

# Dry run (check mode)
ansible-playbook -i inventory/hosts deploy.yml --check

# Limit to specific server
ansible-playbook -i inventory/hosts deploy.yml --limit web-01

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#!/usr/bin/env bash
# Kiểm tra file thay đổi và restart service

CONFIG_FILE="/etc/myapp/config.yml"
BACKUP_FILE="/tmp/config_backup"

current_hash=$(md5sum "$CONFIG_FILE" | awk '{print $1}')

if [[ -f "$BACKUP_FILE" ]]; then
    old_hash=$(cat "$BACKUP_FILE")
else
    old_hash=""
fi

if [[ "$current_hash" != "$old_hash" ]]; then
    echo "Config changed, restarting service..."
    sudo systemctl restart myapp.service
    echo "$current_hash" > "$BACKUP_FILE"
else
    echo "Config unchanged, skipping restart"
fi

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---
- name: Restart service if config changed
  hosts: webservers
  tasks:
    - name: Copy config file
      copy:
        src: files/config.yml
        dest: /etc/myapp/config.yml
      register: config_result

    - name: Restart service
      systemd:
        name: myapp.service
        state: restarted
      when: config_result.changed

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# Bash script gọi Ansible playbook
#!/usr/bin/env bash
set -euo pipefail

echo "Running infrastructure setup..."
ansible-playbook -i inventory/prod setup.yml

echo "Deploying application..."
ansible-playbook -i inventory/prod deploy.yml

echo "Running post-deploy checks..."
ansible-playbook -i inventory/prod health-check.yml

echo "All done!"