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Table of Contents

1. Introduction 1

1. Support 2

2. Installation 3

1. Preparing to Install 4

2. Installing using the live server installer 6

3. Installation using debian-installer 8

4. Upgrading 11

5. Advanced Installation 12

6. Kernel Crash Dump 21

3. Package Management 27

1. Introduction 28

2. dpkg 29

3. Apt 30

4. Aptitude 32

5. Automatic Updates 34

6. Configuration 36

7. References 38

4. Networking 39

1. Network Configuration 40

2. TCP/IP 48

3. Dynamic Host Configuration Protocol (DHCP) 52

4. Time Synchronization 55

5. Data Plane Development Kit 60

5. DM-Multipath 75

1. Device Mapper Multipathing 76

2. Multipath Devices 79

3. Setting up DM-Multipath Overview 82

4. The DM-Multipath Configuration File 86

5. DM-Multipath Administration and Troubleshooting 98

6. Remote Administration 103

1. OpenSSH Server 104

2. Puppet 107

3. Zentyal 110

7. Network Authentication 114

1. OpenLDAP Server 115

2. Samba and LDAP 140

3. Kerberos 146

4. Kerberos and LDAP 154

5. SSSD and Active Directory 161

8. Domain Name Service (DNS) 166

1. Installation 167

2. Configuration 168

3. Troubleshooting 174

4. References 178

9. Security 179

1. User Management 180

2. Console Security 186

3. Firewall 187

4. AppArmor 194

5. Certificates 198

6. eCryptfs 203

10. Monitoring 205

1. Overview 206

2. Nagios 207

3. Munin 211

11. Web Servers 213

1. HTTPD - Apache2 Web Server 214

2. PHP - Scripting Language 221

3. Squid - Proxy Server 223

4. Ruby on Rails 226

5. Apache Tomcat 228

12. Databases 232

1. MySQL 233

2. PostgreSQL 237

13. LAMP Applications 240

1. Overview 241

2. Moin Moin 242

3. phpMyAdmin 244

4. WordPress 246

14. File Servers 248

1. FTP Server 249

2. Network File System (NFS) 253

3. iSCSI Initiator 255

4. CUPS - Print Server 258

15. Email Services 261

1. Postfix 262

2. Exim4 270

3. Dovecot Server 273

4. Mailman 275

5. Mail Filtering 281

16. Chat Applications 288

1. Overview 289

2. IRC Server 290

3. Jabber Instant Messaging Server 292

17. Version Control System 294

1. Bazaar 295

2. Git 296

3. Subversion 299

4. References 304

18. Samba 305

1. Introduction 306

2. File Server 307

3. Print Server 310

4. Securing File and Print Server 312

5. As a Domain Controller 317

6. Active Directory Integration 321

19. Backups 323

1. Shell Scripts 324

2. Archive Rotation 328

3. Bacula 331

20. Virtualization 336

1. libvirt 337

2. Qemu 344

3. Cloud images and uvtool 346

4. Ubuntu Cloud 350

5. LXD 351

6. LXC 362

21. Clustering 377

1. DRBD 378

22. VPN 381

1. OpenVPN 382

23. Other Useful Applications 396

1. pam_motd 397

2. etckeeper 399

3. Byobu 401

A. Appendix 403

1. Reporting Bugs in Ubuntu Server Edition 404

List of Tables

2.1. Recommended Minimum Requirements 4

5.1. Priority Checker Conversion 76

5.2. DM-Multipath Components 77

5.3. Multipath Configuration Defaults 90

5.4. Multipath Attributes 93

5.5. Device Attributes 95

5.6. Useful multipath Command Options 101

17.1. Access Methods 300

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