Ubuntu Server Guide Changes, errors and bugs


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Document Outline

  • Ubuntu Server Guide
    • Changes, errors and bugs
    • Offline
    • Support
  • Basic installation
  • Preparing to Install
    • System requirements
    • Server and Desktop Differences
    • Backing Up
  • Preparing install media
  • Booting the installer
  • Using the installer
  • Advanced Installation
    • Software RAID
      • RAID Configuration
      • Partitioning
      • Degraded RAID
      • RAID Maintenance
      • Resources
    • Logical Volume Manager (LVM)
      • Overview
      • Installation
      • Extending Volume Groups
      • Resources
    • iSCSI
      • Installation on a diskless system
      • Installation on a system with disk attached
      • Installation with iBFT
      • Rebooting to an iSCSI target
  • Package Management
    • Introduction
    • Apt
    • Aptitude
      • Command Line Aptitude
    • dpkg
    • APT Configuration
      • Extra Repositories
    • Automatic Updates
    • Notifications
    • References
  • Kernel Crash Dump
    • Introduction
    • Kernel Crash Dump Mechanism
    • Installation
    • Configuration
      • Local Kernel Crash Dumps
      • Remote Kernel Crash Dumps using the SSH protocol
      • Remote Kernel Crash Dumps using the NFS protocol
    • Verification
    • Testing the Crash Dump Mechanism
    • Resources
  • Reporting Bugs in Ubuntu Server
    • Reporting Bugs With apport-cli
    • Reporting Application Crashes
    • Resources
  • Upgrading
    • do-release-upgrade
  • Device Mapper Multipathing - Introduction
    • Overview
    • Storage Array Overview
    • Multipath Components
    • Multipath Setup Overview
  • Multipath Devices
    • Multipath Device Identifiers
    • Consistent Multipath Device Names in a Cluster
    • Multipath Device attributes
    • Multipath Devices in Logical Volumes
  • Device Mapper Multipathing - Configuration
    • Configuration File Overview
    • Configuration File Defaults
    • Configuration File Blacklist & Exceptions
    • Configuration File Multipath Section
    • Configuration File Devices Section
  • Device Mapper Multipathing - Setup
    • Basic Setup
  • Device Mapper Multipathing - Usage & Debug
    • Resizing Online Multipath Devices
    • Moving root File System from a Single Path Device to a Multipath Device
    • The Multipath Daemon
    • Multipath Command Output
    • Multipath Queries with multipath Command
    • Determining Device Mapper Entries with dmsetup Command
    • Troubleshooting with the multipathd interactive console
  • Networking
  • TCP/IP
    • TCP/IP Introduction
    • TCP/IP Configuration
    • IP Routing
    • TCP and UDP
    • ICMP
    • Daemons
    • Resources
  • Network Configuration
    • Ethernet Interfaces
      • Identify Ethernet Interfaces
      • Ethernet Interface Logical Names
      • Ethernet Interface Settings
    • IP Addressing
      • Temporary IP Address Assignment
      • Dynamic IP Address Assignment (DHCP Client)
      • Static IP Address Assignment
      • Loopback Interface
    • Name Resolution
      • Static Hostnames
      • Name Service Switch Configuration
    • Bridging
    • Resources
  • Dynamic Host Configuration Protocol (DHCP)
    • Installation
    • Configuration
    • References
  • Time Synchronization
    • Synchronizing your systems time
    • Configuring timedatectl and timesyncd
    • Serve the Network Time Protocol
    • chrony(d)
    • Installation
    • Chronyd Configuration
    • View status
    • PPS Support
      • Example configuration for GPSD to feed Chrony
    • References
  • Data Plane Development Kit
    • Prerequisites
    • Unassigning the default Kernel drivers
    • Usage:
    • DPDK Device configuration
    • DPDK HugePage configuration
    • Compile DPDK Applications
    • DPDK in KVM Guests
    • Use DPDK
    • Resources
    • OpenVswitch-DPDK
      • Attaching DPDK ports to OpenVswitch
    • OpenVswitch DPDK to KVM Guests
    • Tuning Openvswitch-DPDK
    • Support and Troubleshooting
    • Resources
  • Security
  • User Management
    • Where is root?
    • Adding and Deleting Users
    • User Profile Security
    • Password Policy
      • Minimum Password Length
      • Password Expiration
    • Other Security Considerations
      • SSH Access by Disabled Users
      • External User Database Authentication
  • AppArmor
    • Using AppArmor
    • Profiles
      • Creating a Profile
      • Updating Profiles
      • Further pre-existing Profiles
    • Checking and debugging denies
    • Profile customization
    • References
  • Firewall
    • Introduction
    • ufw - Uncomplicated Firewall
      • ufw Application Integration
    • IP Masquerading
      • ufw Masquerading
      • iptables Masquerading
    • Logs
    • Other Tools
    • References
  • Certificates
    • Types of Certificates
    • Generating a Certificate Signing Request (CSR)
    • Creating a Self-Signed Certificate
    • Installing the Certificate
    • Certification Authority
    • References
  • Console Security
    • Disable Ctrl+Alt+Delete
  • eCryptfs is deprecated
  • Usage
    • Find available images
    • Launch a fresh instance of the current Ubuntu LTS
    • Check out the running instances
    • Learn more about the VM instance you just launched
    • Connect to a running instance
    • Run commands inside an instance from outside
    • Stop an instance to save resources
    • Delete the instance
    • Integrate into the rest of your virtualization
    • Get help
  • Qemu
    • Running Qemu/KVM
    • Graphics
    • Upgrading the machine type
    • QEMU usage for microvms
  • libvirt
    • Virtual Networking
    • Installation
    • Virtual Machine Management
    • virsh
      • system and session scope
    • Migration
    • Device Passthrough / Hotplug
    • Access Qemu Monitor via libvirt
    • Huge Pages
      • Huge page allocation
      • Huge page usage in libvirt
    • Apparmor isolation
    • Resources
  • Cloud images and uvtool
    • Introduction
    • Creating virtual machines using uvtool
      • Uvtool packages
      • Get the Ubuntu Cloud Image with uvt-simplestreams-libvirt
      • Create the VM using uvt-kvm
      • Connect to the running VM
      • Get the list of running VMs
      • Destroy your VM
      • More uvt-kvm options
    • Resources
    • Introduction
    • Virtual Machine Manager
      • virt-manager guest lifecycle
      • virt-manager guest modification
    • Virtual Machine Viewer
    • virt-install
    • virt-clone
    • Resources
  • LXD
    • Online Resources
    • Installation
    • Kernel preparation
    • Configuration
    • Creating your first container
      • Creating a container
    • LXD Server Configuration
      • Authentication
      • Backing store
    • Container configuration
    • Profiles
    • Nesting
    • Limits
    • UID mappings and Privileged containers
    • Apparmor
    • Seccomp
    • Raw LXC configuration
      • Snapshots
      • Publishing images
      • Image export and import
    • Troubleshooting
  • LXC
    • Installation
    • Basic usage
      • Basic privileged usage
      • User namespaces
      • Basic unprivileged usage
      • Nesting
    • Global configuration
    • Networking
    • LXC startup
    • Backing Stores
    • Templates
    • Autostart
    • Apparmor
      • Customizing container policies
    • Control Groups
    • Cloning
      • Snapshots
      • Ephemeral Containers
    • Lifecycle management hooks
    • Consoles
    • Troubleshooting
      • Logging
      • Monitoring container status
      • Attach
      • Container init verbosity
    • LXC API
    • Security
      • Exploitable system calls
    • Resources
  • Databases
  • MySQL
    • Installation
    • Configuration
    • Database Engines
    • Advanced configuration
      • Creating a tuned configuration
      • MySQL Tuner
    • Resources
  • PostgreSQL
    • Installation
    • Configuration
    • Backups
    • Resources
  • Active Directory Integration
    • Accessing a Samba Share
    • Accessing a Windows Share
    • Resources
  • As a Domain Controller
    • Primary Domain Controller
    • Backup Domain Controller
    • Resources
  • File Server
    • Installation
    • Configuration
    • Resources
  • Samba
  • Introduction
  • Print Server
    • Installation
    • Configuration
    • Resources
  • Securing File and Print Server
    • Samba Security Modes
    • Security = User
    • Share Security
      • Groups
      • File Permissions
    • Samba AppArmor Profile
    • Resources
  • Samba - OpenLDAP Backend
    • Software Installation
    • LDAP Configuration
      • Samba schema
      • Samba indices
      • Adding Samba LDAP objects
    • Samba Configuration
    • Resources
  • CUPS - Print Server
    • Installation
    • Configuration
    • Web Interface
    • References
  • Domain Name Service (DNS)
  • Installation
  • Configuration
    • Overview
    • Caching Nameserver
      • Forward Zone File
      • Reverse Zone File
    • Secondary Server
  • Troubleshooting
    • Testing
      • resolv.conf
      • ping
      • named-checkzone
      • Quick temporary query logging
    • Logging
  • References
  • FTP Server
    • vsftpd - FTP Server Installation
    • Anonymous FTP Configuration
    • User Authenticated FTP Configuration
    • Securing FTP
    • References
  • File Servers
  • Domain Name Service (DNS)
  • iSCSI Initiator (or Client)
    • Network Interfaces Configuration
    • iSCSI Initiator Install
    • iSCSI Initiator Configuration
    • iSCSI Network Configuration
    • Accessing the Logical Units (or LUNs)
    • References
  • Kerberos
    • Overview
    • Kerberos Server
      • Installation
      • Configuration
    • Secondary KDC
    • Kerberos Linux Client
      • Installation
      • Configuration
    • Resources
  • Kerberos and LDAP
    • Configuring OpenLDAP
    • Primary KDC Configuration (LDAP)
    • Secondary KDC Configuration (LDAP)
    • Resources
  • OpenLDAP Server
    • Post-install Inspection
    • Modifying/Populating your Database
      • Adding an index
      • Change the rootDN password:
      • Adding a schema
      • Logging
    • Backup and Restore
    • References
  • OpenLDAP Replication
    • Provider Configuration - replication user
    • Provider Configuration - standard replication
    • Consumer Configuration - standard replication
    • Provider Configuration - delta replication
      • Add syncprov and accesslog overlays and DBs
    • Consumer Configuration
    • Testing
    • References
    • LDAP Workstation Authentication
    • User and Group Management - ldapscripts
    • Resources
    • LDAP & TLS
  • Network File System (NFS)
    • Installation
    • Configuration
    • NFS Client Configuration
    • References
  • OpenSSH Server
    • Introduction
    • Installation
    • Configuration
    • SSH Keys
    • Import keys from public keyservers
    • Two factor authentication with U2F/FIDO
    • References
  • VPN
  • OpenVPN
    • Server Installation
    • Public Key Infrastructure Setup
      • Certificate Authority Setup
      • Server Keys and Certificates
      • Client Certificates
    • Simple Server Configuration
    • Simple Client Configuration
    • First trouble shooting
    • Advanced configuration
      • Advanced routed VPN configuration on server
      • Advanced bridged VPN configuration on server
    • References
    • Installing a gitolite server
    • Gitolite configuration
    • Managing gitolite users and repositories
    • Using your server
  • References
    • Client software implementations
      • Linux Network-Manager GUI for OpenVPN
      • OpenVPN with GUI for Mac OS X
      • OpenVPN with GUI for Win
    • References
  • SSSD
    • SSSD and Active Directory
      • Prerequisites, Assumptions, and Requirements
      • Software Installation
      • Join the domain
      • SSSD Configuration
      • Automatic home directory creation
      • Checks
      • Kerberos Tickets
      • Desktop Ubuntu Authentication
      • Resources
    • SSSD and LDAP
      • Prerequisites, Assumptions, and Requirements
      • Software Installation
      • SSSD Configuration
      • Automatic home directory creation
      • Check SSL setup on the client
      • Final verification
    • SSSD, LDAP and Kerberos
      • Prerequisites, Assumptions, and Requirements
      • Software Installation
      • SSSD Configuration
      • Automatic home directory creation
      • Final verification
    • SSSD and KDC spoofing
    • Debugging and troubleshooting
      • debug_level
      • Caching
    • Installation
    • Configuration
    • References
  • Dovecot Server
    • Installation
    • Configuration
    • Dovecot SSL Configuration
    • Firewall Configuration for an Email Server
    • References
  • Exim4
    • Installation
    • Configuration
    • SMTP Authentication
    • Configuring SASL
    • References
  • Email Services
  • Mailman
    • Installation
      • Apache2
      • Postfix
      • Exim4
      • Mailman
    • Configuration
      • Apache2
      • Postfix
      • Exim4
      • Main
      • Transport
      • Router
      • Mailman
    • Administration
    • Users
    • References
  • Mail Filtering
    • Installation
    • Configuration
      • ClamAV
      • Spamassassin
      • Amavisd-new
      • Postfix
      • Amavisd-new and Spamassassin
    • Testing
    • Troubleshooting
    • References
  • Postfix
    • Installation
    • Basic Configuration
    • SMTP Authentication
    • Configuring SASL
    • Testing
    • Troubleshooting
      • Escaping chroot
      • SMTPS
      • Log Viewing
      • Increasing Logging Detail
      • Logging mail delivery
      • Increasing daemon verbosity
      • Logging SASL debug info
  • Squid
    • Installation
    • Configuration
    • References
  • HTTPD - Apache2 Web Server
    • Installation
    • Configuration
      • Basic Settings
      • Default Settings
      • apache2 Settings
      • Apache2 Modules
    • HTTPS Configuration
    • Sharing Write Permission
    • References
  • Apache Tomcat
    • System-wide installation
    • Configuration
      • Changing default ports
      • Changing JVM used
      • Declaring users and roles
    • Using Tomcat standard webapps
      • Tomcat documentation
      • Tomcat administration webapps
      • Tomcat examples webapps
    • Using private instances
      • Installing private instance support
      • Creating a private instance
      • Configuring your private instance
      • Starting/stopping your private instance
    • References
  • Web Servers
    • Implementation
  • Introduction to High Availability
    • High Availability Clusters
    • High Availability Cluster Heartbeat
    • High Availability Cluster Quorum
    • Example
    • Fencing
  • Linux High Availability Projects
    • Ubuntu HA Core Packages
    • Ubuntu HA Community Packages
    • Ubuntu HA Deprecated Packages
    • Ubuntu HA Related Packages
    • Upstream Documentation
    • Resource Agents: main
  • Resource Agents: [universe]
  • Resource Agents: [universe]-community
  • Resource Agents: [non-supported]
  • Resource Agents: [deprecated]
  • Ubuntu HA - Pacemaker Fence Agents Supportability
    • Fence Agents: main
  • Fence Agents: [universe]
  • Fence Agents: [universe]-community
  • Fence Agents: [non-supported]
  • Fence Agents: [deprecated]
  • Ubuntu HA - DRBD
    • Configuration
    • Testing
    • References
  • Byobu
    • Resources
  • etckeeper
    • Resources
  • Munin
    • Installation
    • Configuration
    • Additional Plugins
    • References
  • Nagios
    • Installation
    • Configuration Overview
    • Configuration
    • References
  • pam_motd
    • Resources
  • Puppet
    • Preconfiguration
    • Installation
    • Configuration
    • Resources
  • Zentyal
    • Installation
    • First steps
    • Modules
    • References
  • Monitoring
  • Overview
  • Nagios
    • Installation
    • Configuration Overview
    • Configuration
    • References
  • Munin
    • Installation
    • Configuration
    • Additional Plugins
    • References
  • Rsnapshot
    • Configuration
    • Test Configuration
    • Scheduling Backups
      • References
  • PHP - Scripting Language
    • Installation
    • Configuration
    • Testing
    • References
  • Ruby on Rails
    • Installation
    • Configuration
      • Web Server
      • Database
    • References
  • Backups
  • Archive Rotation
    • Rotating NFS Archives
    • Tape Drives
  • Bacula
    • Overview
    • Installation
    • Configuration
    • Localhost Backup
    • Resources
  • Shell Scripts
    • Simple Shell Script
    • Executing the Script
      • Executing from a Terminal
      • Executing with cron
    • Restoring from the Archive
    • References
  • LAMP Applications
  • Overview
  • Moin Moin
    • Installation
    • Configuration
    • Verification
    • References
  • phpMyAdmin
    • Installation
    • Configuration
    • References
  • WordPress
    • Installation
    • Configuration
    • References
  • LAMP Applications
  • Overview
  • phpMyAdmin
    • Installation
    • Configuration
    • References
  • WordPress
    • Installation
    • Configuration
    • References
  • Using the installer
    • Getting the installer
    • Installer UI generalities
    • Running the installer over serial
    • Help menu
    • Switching to a shell prompt
    • Global keys
  • Using the installer step by step
    • Language selection
    • Refresh
    • Keyboard
    • Zdev (s390x only)
    • Network
    • Proxy
    • Mirror
    • Storage
    • Identity
    • SSH
    • Snaps
    • Installation logs
  • Configuring storage in the server installer
    • Guided options
    • The main storage screen
    • Partitions
    • RAID
    • LVM
    • Selecting boot devices
    • Limitations and workarounds
  • Automated Server Installs
  • Introduction
  • Differences from debian-installer preseeding
  • Providing the autoinstall config
  • Running a truly automatic autoinstall
  • Quick start
  • Creating an autoinstall config
  • The structure of an autoinstall config
  • Error handling
  • Possible future directions
  • Autoinstall Quick Start
    • Providing the autoinstall data over the network
      • Download the ISO
      • Mount the ISO
      • Write your autoinstall config
      • Serve the cloud-init config over http
      • Create a target disk
      • Run the install!
      • Boot the installed system
    • Using another volume to provide the autoinstall config
      • Download the ISO
      • Create your user-data & meta-data files
      • Create an ISO to use as a cloud-init data source
      • Create a target disk
      • Run the install!
      • Boot the installed system
  • JSON Schema for autoinstall config
    • Introduction
    • How the config is validated
    • Schema
    • Regeneration
  • Automated Server Installs Config File Reference
  • Overall format
  • Schema
  • Top-level keys
    • update
    • channel
    • layout
    • variant
    • toggle
    • Supported layouts
    • action-based config
    • realname
    • username
    • hostname
    • password
    • install-server
    • authorized-keys
    • allow-pw
  • Netbooting the server installer on amd64
    • Configuring DHCP/bootp and tftp
    • Serving the bootloaders and configuration.
      • Mode independent set up
      • Setting up the files for UEFI booting
      • Setting up the files for legacy boot
  • Eventually the initial subiquity installer screen shows up:

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