Server

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Service commands

sudo /etc/init.d/<service> restart
  ubuntu, restart a service

sudo /etc/rc.d/<service> stop | start | restart
  arch, service things - old, use systemd now

General

Sysadmin

Logging

Basics

  • logrotate is designed to ease administration of systems that generate large numbers of log files. It allows automatic rotation, compression, removal, and mailing of log files. Each log file may be handled daily, weekly, monthly, or when it grows too large.

Systems

  • logger - a shell command interface to the syslog(3) system log module
  • Rsyslog is an enhanced syslogd supporting, among others, MySQL, PostgreSQL, failover log destinations, syslog/tcp, fine grain output format control, high precision timestamps, queued operations, the ability to filter on any message part and encryption protected syslog relay chains. It is quite compatible to stock sysklogd and can be used as a drop-in replacement.
  • glTail.rb - Real-time visualization of server traffic, events and statistics with Ruby, SSH and OpenGL.
  • log.io Real-time log monitoring in your browser. Powered by node.js + socket.io
  • logstash is a tool for managing events and logs. You can use it to collect logs, parse them, and store them for later use (like, for searching). Speaking of searching, logstash comes with a web interface for searching and drilling into all of your logs.

Services

Monitoring

See also Network#Monitoring, *nix#Monitoring

If it's up... A.K.A... It's down... per year
90% n/a 876 hours
95% n/a 438 hours
99% two 9s 87 hours, 36 minutes
99.9% three 9s 8 hours, 45 minutes, 36 seconds
99.99% four 9s 52 minutes, 33.6 seconds
99.999% five 9s 5 minutes, 15.36 seconds
99.9999% six 9s 31.68 seconds

Collectd

collectd is a daemon which collects system performance statistics periodically and provides mechanisms to store the values in a variety of ways, for example in RRD files. collectd gathers statistics about the system it is running on and stores this information. Those statistics can then be used to find current performance bottlenecks (i.e. performance analysis) and predict future system load (i.e. capacity planning). Or if you just want pretty graphs of your private server and are fed up with some homegrown solution you're at the right place, too ;).

Nagios

  • Nagios is a powerful monitoring system that enables organizations to identify and resolve IT infrastructure problems before they affect critical business processes. Designed with scalability and flexibility in mind, Nagios gives you the peace of mind that comes from knowing your organization's business processes won't be affected by unknown outages.

Monit

  • Monit is a free open source utility for managing and monitoring, processes, programs, files, directories and filesystems on a UNIX system. Monit conducts automatic maintenance and repair and can execute meaningful causal actions in error situations.
  • M/Monit expand upon Monit's capabilities to provide monitoring and management of all Monit enabled hosts from one easy to use web-interface.

Splunk

  • Splunk is powerful and versatile IT search software that takes the pain out of tracking and utilizing the information in your data center. If you have Splunk, you won't need complicated databases, connectors, custom parsers or controls--all that's required is a web browser and your imagination. Splunk handles the rest.

Amon

  • Amon is an application and system monitoring toolkit for web developers. Its goal is to provide you with all the information you need about the health of your servers and the errors that occur in your web application.

other

Zenoss

Services

New Relic

==== Rackspace

Management

  • Webmin is a web-based interface for system administration for Unix. Using any modern web browser, you can setup user accounts, Apache, DNS, file sharing and much more. Webmin removes the need to manually edit Unix configuration files like /etc/passwd, and lets you manage a system from the console or remotely.
  • Virtualmin is a powerful and flexible web hosting control panel for Linux and UNIX systems based on the well-known Open Source web-based systems management GUI, Webmin. Manage your virtual domains, mailboxes, databases, applications, and the entire server, from one comprehensive and friendly interface.
  • Ehcp is a Hosting Control Panel to facilate the process of managing domains, e-mail, users, etc.
  • AlternC is a set of software management on Linux shared hosting, easy to use, easy to install, based solely on free software, GPL v2 +. Systems for automatic installation and configuration, control panel accessible via the web for the management of users and web services (domains, emails, ftp accounts, statistics ...). Technically, AlternC is currently based on Debian GNU / Linux 'Stable' (Squeeze to date), and use other software such as Apache, Postfix, Mailman ... It also contains API documentation, allowing easy customization of the office, 'web control panel' AlternC.

Performance

See also HTTP#Performance

  • irqbalance is a Linux* daemon that distributes interrupts over the processors and cores you have in your computer system. The design goal of irqbalance is to do find a balance between power savings and optimal performance. To a large degree, the work irqbalance does is invisible to you; if irqbalance performs its job right, nobody will ever notice it's there or want to turn it off.
  • HAProxy - The Reliable, High Performance TCP/HTTP Load Balancer.
  • Pound is a reverse proxy - that means you put it on the server in front of your web services, not in front of your clients who need to connect to the general Internet. It takes web requests from end-users and distributes them among several web servers or services you may be running. Pound is also load balancing, so you can run multiple servers that look to the outside world as if they are just one, allowing you to spread the workload around. Pound proxy is NOT a caching proxy. By itself it won't help to speed up your server or network, but there is a lot of flexibility in Pound that will help you overall.

memcached

  • magent is a simple but useful proxy program for memcached servers.

Redis

See also DB#Redis

CDN Services

Other

Filesystem

Knowledge management

Video streaming

Media

See also Platforms#Digital_media

Push/pull

Superfeedr

Storage

WebDAV

"Linux users can mount WebDAV shares using the davfs2 and the fusedav file system modules which mount them as Coda or FUSE filesystems. KDE has native WebDAV support as part of kio_http. This enables Dolphin, Konqueror, and every other KDE application to interact directly with WebDAV servers. Nautilus also has WebDAV support built in. Many Linux distributions also include the cadaver command-line client interface, which provides an FTP-like command set. The Apache HTTP Server provides WebDAV modules based on both davfs and Apache Subversion (svn)."

  • fusedav is a Linux userspace file system driver for mounting WebDAV shares. It makes use of FUSE as userspace file system API and neon as WebDAV API.

Other

Remote

Co-lo

Troubleshooting

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