infra-automation/roles/deploy_linux_vm/README.md

# Ansible Role: deploy_linux_vm

Deploy Linux virtual machines on KVM hypervisors with LVM storage configuration, security hardening, and cloud-init provisioning. This role supports multiple Linux distributions and implements CLAUDE.md security requirements including LVM partitioning and SSH hardening.

## Features

- **Multi-Distribution Support**: Debian, Ubuntu, RHEL, CentOS Stream, Rocky Linux, AlmaLinux, SLES, openSUSE
- **LVM Configuration**: Automatic LVM setup with meaningful volume groups and logical volumes per CLAUDE.md
- **Security Hardening**:
  - SSH hardening with GSSAPI disabled
  - SELinux enforcing (RHEL family)
  - AppArmor enabled (Debian family)
  - Firewall configuration (UFW/firewalld)
  - Automatic security updates
  - Audit daemon enabled
- **Cloud-Init**: Automated provisioning with distribution-specific configurations
- **Modular Design**: Tag-based execution for selective deployment stages
- **Production Ready**: Idempotent, well-tested, and CLAUDE.md compliant

## Requirements

### Hypervisor Requirements

- Ansible 2.12 or higher
- KVM/libvirt virtualization enabled
- Sufficient disk space in `/var/lib/libvirt/images`
- Network connectivity for cloud image downloads

### Supported Distributions (Guest VMs)

| Distribution | Versions | OS Family |
|--------------|----------|-----------|
| Debian | 11, 12 | debian |
| Ubuntu | 20.04 LTS, 22.04 LTS, 24.04 LTS | debian |
| RHEL | 8, 9 | rhel |
| CentOS Stream | 8, 9 | rhel |
| Rocky Linux | 8, 9 | rhel |
| AlmaLinux | 8, 9 | rhel |
| SLES | 15 | suse |
| openSUSE Leap | 15.5, 15.6 | suse |

## Role Variables

### Required Variables

| Variable | Required | Default | Description |
|----------|----------|---------|-------------|
| `deploy_linux_vm_os_distribution` | Yes | debian-12 | Distribution identifier (e.g., ubuntu-22.04, almalinux-9) |

### VM Configuration

| Variable | Default | Description |
|----------|---------|-------------|
| `deploy_linux_vm_name` | linux-guest | VM name in libvirt |
| `deploy_linux_vm_hostname` | linux-vm | VM hostname |
| `deploy_linux_vm_domain` | localdomain | Domain name |
| `deploy_linux_vm_vcpus` | 2 | Number of vCPUs |
| `deploy_linux_vm_memory_mb` | 2048 | RAM in MB |
| `deploy_linux_vm_disk_size_gb` | 30 | Primary disk size in GB |

### LVM Configuration

| Variable | Default | Description |
|----------|---------|-------------|
| `deploy_linux_vm_use_lvm` | true | Enable LVM configuration |
| `deploy_linux_vm_lvm_vg_name` | vg_system | Volume group name |
| `deploy_linux_vm_lvm_pv_device` | /dev/vdb | Physical volume device |
| `deploy_linux_vm_lvm_volumes` | (see defaults) | List of logical volumes per CLAUDE.md |

#### LVM Volumes (CLAUDE.md Compliance)

Default logical volumes created:

```yaml
deploy_linux_vm_lvm_volumes:
  - { name: lv_opt, size: 3G, mount: /opt, fstype: ext4 }
  - { name: lv_tmp, size: 1G, mount: /tmp, fstype: ext4, mount_options: noexec,nosuid,nodev }
  - { name: lv_home, size: 2G, mount: /home, fstype: ext4 }
  - { name: lv_var, size: 5G, mount: /var, fstype: ext4 }
  - { name: lv_var_log, size: 2G, mount: /var/log, fstype: ext4 }
  - { name: lv_var_tmp, size: 5G, mount: /var/tmp, fstype: ext4, mount_options: noexec,nosuid,nodev }
  - { name: lv_var_audit, size: 1G, mount: /var/log/audit, fstype: ext4 }
  - { name: lv_swap, size: 2G, mount: none, fstype: swap }
```

### SSH Configuration

| Variable | Default | Description |
|----------|---------|-------------|
| `deploy_linux_vm_ssh_permit_root_login` | no | Allow root SSH login |
| `deploy_linux_vm_ssh_password_authentication` | no | Allow password authentication |
| `deploy_linux_vm_ssh_gssapi_authentication` | no | **GSSAPI disabled per requirements** |
| `deploy_linux_vm_ssh_gssapi_cleanup_credentials` | no | GSSAPI cleanup |
| `deploy_linux_vm_ssh_max_auth_tries` | 3 | Maximum authentication attempts |
| `deploy_linux_vm_ssh_client_alive_interval` | 300 | SSH keepalive interval |

### Security Configuration

| Variable | Default | Description |
|----------|---------|-------------|
| `deploy_linux_vm_enable_firewall` | true | Enable firewall (UFW/firewalld) |
| `deploy_linux_vm_enable_selinux` | true | Enable SELinux (RHEL family) |
| `deploy_linux_vm_enable_apparmor` | true | Enable AppArmor (Debian family) |
| `deploy_linux_vm_enable_auditd` | true | Enable audit daemon |
| `deploy_linux_vm_enable_automatic_updates` | true | Enable automatic security updates |
| `deploy_linux_vm_automatic_reboot` | false | Auto-reboot after updates |

### User Configuration

| Variable | Default | Description |
|----------|---------|-------------|
| `deploy_linux_vm_ansible_user` | ansible | Service account username |
| `deploy_linux_vm_ansible_user_ssh_key` | (default key) | SSH public key for ansible user |
| `deploy_linux_vm_root_password` | ChangeMe123! | Root password (console access) |

## Dependencies

None. This role is self-contained.

## Example Playbook

### Basic Deployment

```yaml
---
- name: Deploy Linux VM
  hosts: grokbox
  become: yes
  roles:
    - role: deploy_linux_vm
      vars:
        deploy_linux_vm_name: "web-server"
        deploy_linux_vm_os_distribution: "ubuntu-22.04"
```

### Advanced Deployment with Custom LVM

```yaml
---
- name: Deploy Database Server with Custom Resources
  hosts: grokbox
  become: yes
  roles:
    - role: deploy_linux_vm
      vars:
        deploy_linux_vm_name: "db-server"
        deploy_linux_vm_hostname: "postgres01"
        deploy_linux_vm_domain: "production.local"
        deploy_linux_vm_os_distribution: "almalinux-9"
        deploy_linux_vm_vcpus: 8
        deploy_linux_vm_memory_mb: 16384
        deploy_linux_vm_disk_size_gb: 100
        deploy_linux_vm_use_lvm: true
        deploy_linux_vm_lvm_vg_name: "vg_database"
```

### Multi-VM Deployment

```yaml
---
- name: Deploy Multiple VMs
  hosts: grokbox
  become: yes
  tasks:
    - name: Deploy web servers
      include_role:
        name: deploy_linux_vm
      vars:
        deploy_linux_vm_name: "{{ item.name }}"
        deploy_linux_vm_hostname: "{{ item.hostname }}"
        deploy_linux_vm_os_distribution: "{{ item.distro }}"
      loop:
        - { name: "web01", hostname: "web01", distro: "ubuntu-22.04" }
        - { name: "web02", hostname: "web02", distro: "ubuntu-22.04" }
        - { name: "db01", hostname: "db01", distro: "almalinux-9" }
```

## Tag-Based Execution

Execute specific deployment stages:

```bash
# Pre-flight validation only
ansible-playbook site.yml --tags validate,preflight

# Download cloud images only
ansible-playbook site.yml --tags download,verify

# Deploy VM without LVM configuration
ansible-playbook site.yml --skip-tags lvm

# Configure LVM only (post-deployment)
ansible-playbook site.yml --tags lvm,post-deploy

# Full deployment with all stages
ansible-playbook site.yml
```

### Available Tags

| Tag | Description |
|-----|-------------|
| `validate`, `preflight` | Pre-flight validation checks |
| `install` | Install required packages on hypervisor |
| `download`, `verify` | Download and verify cloud images |
| `storage` | Create VM disk storage |
| `cloud-init` | Generate cloud-init configuration |
| `deploy` | Deploy and start VM |
| `lvm`, `post-deploy` | Configure LVM on deployed VM |
| `cleanup` | Remove temporary files |

## LVM Configuration Process

The role implements a comprehensive LVM setup:

1. **Physical Volume Creation**: Creates PV on `/dev/vdb` (30GB secondary disk)
2. **Volume Group Setup**: Creates `vg_system` volume group
3. **Logical Volume Creation**: Creates LVs per CLAUDE.md specifications
4. **Filesystem Creation**: Formats LVs with ext4/swap
5. **Data Migration**: Copies existing data from primary disk to LVM volumes
6. **Fstab Update**: Configures automatic mounting at boot
7. **Reboot Required**: VM must be rebooted to activate new mounts

### LVM Post-Deployment

After role execution with LVM enabled:

```bash
# SSH to the VM
ssh ansible@<VM_IP>

# Verify LVM configuration
sudo vgs
sudo lvs
sudo pvs

# Check fstab entries
cat /etc/fstab

# Reboot to activate LVM mounts
sudo reboot

# After reboot, verify mounts
df -h
lsblk
```

## SSH Hardening

The role implements comprehensive SSH hardening per requirements:

- **GSSAPI Authentication**: Disabled (`GSSAPIAuthentication no`)
- **GSSAPI Cleanup**: Disabled (`GSSAPICleanupCredentials no`)
- **Root Login**: Disabled via SSH (console access available)
- **Password Authentication**: Disabled (key-based only)
- **Connection Limits**: Max 3 auth tries, 10 sessions
- **Keepalive**: 300s interval with 2 max count
- **Additional Hardening**: Empty passwords rejected, X11 forwarding disabled

Configuration file: `/etc/ssh/sshd_config.d/99-security.conf`

## Security Features

### Debian/Ubuntu Systems

- **Firewall**: UFW enabled with SSH allowed
- **AppArmor**: Enabled and enforcing
- **Automatic Updates**: `unattended-upgrades` configured for security updates only
- **Audit**: `auditd` enabled
- **Time Sync**: `chrony` configured

### RHEL/AlmaLinux/Rocky Systems

- **Firewall**: `firewalld` enabled with SSH allowed
- **SELinux**: Enforcing mode enabled
- **Automatic Updates**: `dnf-automatic` configured for security updates
- **Audit**: `auditd` enabled
- **Time Sync**: `chronyd` configured

### Essential Packages (CLAUDE.md)

All VMs include:
- System tools: `vim`, `htop`, `tmux`, `jq`, `bc`
- Network tools: `curl`, `wget`, `rsync`
- Development: `git`, `python3`, `python3-pip`
- Security: `aide`, `auditd`, `chrony`
- Storage: `lvm2`, `parted`

## Validation

Post-deployment validation includes:

- VM running status check
- IP address assignment verification
- SSH connectivity test
- System information gathering
- LVM configuration verification (if enabled)

## Troubleshooting

### Cloud-Init Issues

```bash
# Check cloud-init status
ssh ansible@<VM_IP> "cloud-init status --wait"

# View cloud-init logs
ssh ansible@<VM_IP> "tail -f /var/log/cloud-init-output.log"
```

### LVM Issues

```bash
# Check LVM status on VM
ssh ansible@<VM_IP> "sudo vgs && sudo lvs && sudo pvs"

# Verify fstab
ssh ansible@<VM_IP> "cat /etc/fstab"

# Check disk layout
ssh ansible@<VM_IP> "lsblk"
```

### SSH Connection Issues

```bash
# Test SSH with ProxyJump
ssh -J grokbox ansible@<VM_IP>

# Verify SSH configuration
ssh ansible@<VM_IP> "sudo sshd -T | grep -i gssapi"
```

### Firewall Issues

```bash
# Debian/Ubuntu
ssh ansible@<VM_IP> "sudo ufw status verbose"

# RHEL/AlmaLinux
ssh ansible@<VM_IP> "sudo firewall-cmd --list-all"
```

## File Locations

On deployed VMs:

- SSH Security Config: `/etc/ssh/sshd_config.d/99-security.conf`
- Sudoers Config: `/etc/sudoers.d/ansible`
- Cloud-Init Log: `/var/log/cloud-init-output.log`
- Fstab: `/etc/fstab` (updated with LVM mounts)

On hypervisor:

- Cloud Images: `/var/lib/libvirt/images/*.qcow2`
- VM Disks: `/var/lib/libvirt/images/<vm_name>.qcow2`
- LVM Disk: `/var/lib/libvirt/images/<vm_name>-lvm.qcow2`
- Cloud-Init ISO: `/var/lib/libvirt/images/<vm_name>-cloud-init.iso`

## License

MIT

## Author

Infrastructure Team

## Support

- Documentation: `docs/linux-vm-deployment.md`
- Cheatsheet: `cheatsheets/deploy-linux-vm.md`
- Guidelines: `CLAUDE.md`