LPIC-3 Certification Guide: Mixed Environments, Security, and High Availability
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The LPIC-3 certification is the highest level of the Linux Professional Institute (LPI) certification program. It validates senior-level Linux administration skills across multiple specializations, including mixed network environments with Unix and Windows integration, enterprise security hardening, and high-availability infrastructure.
Candidates must hold an active LPIC-2 certification before attempting any LPIC-3 exam.
LPIC-3 offers three specialization exams. Passing any one of them earns the LPIC-3 certification:
| Exam | Code | Duration | Questions | Passing Score |
|---|---|---|---|---|
| Mixed Environment | 300 | 90 minutes | 60 | 500 / 800 |
| Security | 303 | 90 minutes | 60 | 500 / 800 |
| Virtualization & High Availability | 304 | 90 minutes | 60 | 500 / 800 |
All exam objectives are updated approximately every five years. The current objectives (version 3.0 for 300, version 2.0 for 303/304) were released in 2023.
The Mixed Environment exam covers integration of Linux systems with Unix, Windows, and macOS networks. It focuses on identity management, file sharing, and directory services.
| Topic | Weight | Description |
|---|---|---|
| Samba Basics | 5% | NetBIOS/NetBEUI concepts, Samba daemons (smbd, nmbd, winbindd), smb.conf configuration |
| Samba File Sharing | 10% | Share definitions, file permissions, browse lists, printer sharing |
| Samba Authentication and Security | 15% | User-level and share-level security, domain membership, SID mapping, idmap backends |
| Samba Identity Management | 10% | winbind integration, PAM configuration, name service switch (nsswitch) |
| LDAP Integration | 20% | OpenLDAP server setup, LDAP schema, search filters, TLS encryption, LDAP authentication with PAM and NSS |
| Kerberos Authentication | 15% | Kerberos realm configuration, keytab management, ticket policies, integration with Samba and LDAP |
| Name Services | 10% | BIND DNS configuration, zone files, dynamic DNS updates with Samba AD |
| File and Print Services | 10% | CUPS integration, printer sharing via Samba, access control |
| NFS and Network File Systems | 5% | NFSv4 exports, Kerberized NFS, automounter |
The Security exam covers enterprise Linux security hardening, from system-level controls to cryptographic infrastructure and mandatory access control systems.
| Topic | Weight | Description |
|---|---|---|
| Cryptography | 15% | Symmetric and asymmetric encryption, OpenSSL, GPG, PKI infrastructure, certificate management |
| System Security | 15% | Pluggable Authentication Modules (PAM), secure console configuration, user resource limits, login policies |
| Network Security | 15% | Packet filtering with nftables/iptables, firewalld, fail2ban, TCP wrappers |
| Mandatory Access Control | 20% | SELinux and AppArmor: policies, contexts, booleans, audit logs, troubleshooting |
| Event Monitoring and Logging | 10% | rsyslog, systemd-journald, auditd, log rotation, remote logging |
| File Integrity and Intrusion Detection | 10% | AIDE, Tripwire, rkhunter, chkrootkit, file integrity verification |
| Vulnerability Assessment | 10% | OpenVAS, Lynis, security scanning, patch management, CVE tracking |
| Incident Response | 5% | Evidence collection, forensic imaging, chain of custody, incident containment |
The Virtualization and High Availability exam covers virtual machine management, container orchestration, and enterprise cluster configuration.
| Topic | Weight | Description |
|---|---|---|
| Virtual Machine Management | 15% | KVM/QEMU configuration, libvirt, virsh, VM lifecycle, snapshots, live migration |
| Container Management | 10% | Docker, Podman, container images, volumes, networking, Docker Compose |
| Container Orchestration | 10% | Kubernetes concepts, pods, deployments, services, kubectl |
| High Availability Concepts | 15% | Cluster architectures, quorum, fencing (STONITH), resource groups |
| Cluster Management | 15% | Pacemaker/Corosync configuration, resource agents, constraints, colocation |
| Cluster Storage | 15% | DRBD, shared storage (iSCSI, FC), GFS2, OCFS2 cluster filesystems |
| Load Balancing | 10% | LVS (Linux Virtual Server), HAProxy, keepalived, VRRP |
| Backup and Restore | 10% | Cluster-aware backup strategies, snapshots, disaster recovery planning |
LPIC-3 exams require a solid LPIC-2 foundation. Key prerequisites include:
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