Realize the flexibility of OpenSSH
With OpenSSH, you can access systems remotely and securely, transfer files securely, secure normally insecure services, and much more.
Delegate privileges to users with sudo
Sudo allows for flexible delegation of user privileges, and the ability to fine-tune those privileges to provide different levels of access.
Find more stories in: Open source, NetworkingDig for more data in the /proc directory
The virtual filesystem provides a plethora of information on the hardware of the running system, and of the various processes running.
Find more stories in: Open source, Operating systemsFind weak OpenSSL/OpenSSH keys and secure your system
Use a tool provided by the Debian team, which can be run regardless of whether the Debian system is used, to determine if weak keys exist in the system.
Find more stories in: Open source, LinuxLog Linux services with runit
Learn how to keep critical information on top of supervising services, with a program called svlogd in runit.
Find more stories in: Open source, LinuxUse runit to supervise Linux services
Traditional Linux systems use SysV init for starting the system: running init scripts to start and stop services as well as manage system runlevels and one-time startup scripts.
Find more stories in: Linux, Open sourceLearn to use the openssl command-line program
More than just an open source SSL library implementation, OpenSSL can be used to create, request, sign, and revoke certificates and can also be used to perform other cryptographic operations.
Find more stories in: Networking, SecurityTry IRC with Irssi to communicate via chat
IRC, or Internet Relay Chat, is a fantastic method of communication with peers, particularly if you are part of a development group or want to get support with a particular piece of software or project.
Find more stories in: Open source, Instant messagingUsing vi key bindings in bash and zsh
When making command-line changes, you can choose a style that makes sense and makes the use of the command line faster and more efficient.
Find more stories in: Open sourceUse command-line MySQL for additional flexibility
The more popular ways of using MySQL are to use GUI front ends, such as phpMyAdmin or the MySQL GUI administration tools.
Find more stories in: SoftwareSecurely delete files with shred
Scrub your data using the shred command for files that contain sensitive information, so that they cannot be recovered later with data retrieval tools.
Find more stories in: Linux, Open source, Security Management, Security applications/toolsDetect intruders on your network with Snort
Snort is a Network Intrusion Detection System (NIDS), which can view and analyze packets on a network to determine whether or not a system is being attacked by remote.
Find more stories in: Networking, Open sourceConfigure Snort to log packets to MySQL
Administrators can take advantage of the Snort facility to to detect intrusions to the network.
Find more stories in: Networking, Open sourceSet up a TFTP server for easy network boots
Although the occasion may be rare, there can come a time when you need to set up and use a Trivial FTP (or TFTP) server.
Find more stories in: Networking, Open sourceSet up ISC's dhcpd server
With DHCP, simply changing one configuration file lets the administrator set up hosts with different IPs or netmasks instead of changing each host individually.
Find more stories in: Networking, Open sourceSecure temporary files in Linux
Ensuring proper permissions and using restrictive mount options can prevent bots and rootkits from compromising a system.
Find more stories in: LinuxEncrypting and decrypting files with GnuPG
You can use GnuPG, the open replacement for PGP, to manage cryptographic signatures to files or e-mail, as well as a tool to encrypt and decrypt sensitive files.
Find more stories in: Digital signatures, Open sourceTuning Linux kernel for more aggressive network throughput
The Linux kernel and the distributions that package it typically provide very conservative defaults to certain network settings that affect networking parameters.
Find more stories in: LinuxGet started with GnuPG
Available with every Linux distribution, GnuPG can be used to encrypt regular files or e-mail and can also verify the integrity of files or e-mail via cryptographic signatures.
Find more stories in: Linux, Open sourceUse tcpdump for network debugging
Tcpdump may not be as feature-rich as programs such as Wireshark, but it is an extremely useful network packet tracing system.
Find more stories in: Open source, Network administration/implementation, Network standards/protocolsAuto-reboot Linux after a kernel panic
Making a small modification to a configuration file that tweaks many kernel operating parameters can automatically reboot the operating system.
Find more stories in: Linux, Disaster recovery, Data backup, disaster recovery
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