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Web Hosting Knowledge Base by Liquid Web

Knowledge Base


How To Install Cassandra on CentOS 7
Filed under: Technical Support

Apache Cassandra is a NoSQL database intended for storing large amounts of data in a decentralized, highly available cluster. NoSQL refers to a database with a data model other than the tabular relations used in relational databases such as MySQL, PostgreSQL, and Microsoft SQL.

Pre-Flight Check
  • These instructions are intended for installing Cassandra 2 on a single CentOS 7 node.
  • I’ll be working from a Liquid Web Core Managed CentOS 7 server, and I’ll be logged in as root.
  • You may be able to skip to Step #2 if you already have a stable version of Java 7 (preferably the Oracle/Sun JVM). Check to see if your server already has Java installed by running the following command: java -version
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Error: Failed to connect to ’127.0.0.1:7199′: Connection refused (Cassandra) [SOLVED]
Filed under: Technical Support
Pre-Flight Check
  • These instructions are intended specifically for solving the error: Failed to connect to ’127.0.0.1:7199′: Connection refused.
  • I’ll be working from both Liquid Web Core Managed CentOS 6 and CentOS 7 servers, and I’ll be logged in as root.

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Proactive Server Maintenance Checklist, Prior to Reboot
Filed under: Technical Support
Take a Backup, or Be Sure Backups are Running

We have tutorials on How to Create a Storm Server Backup, and How to Restore a Storm Server Backup.

Check Running Processes

Liquid Web’s Heroic Support team closely monitors the load on your servers with Sonar® proactive monitoring and service restoration. That said, it’s always wise to glance at what processes are running on your server to assure your services are running as expected. Check-out our tutorial on Monitoring Server Processes with Top for Linux.

Verify Services Will Start at Boot

Be sure to verify that all of your necessary services are configured to start when the server boots up. For CentOS users, you can follow this tutorial: chkconfig Command Examples for Red Hat and CentOS.

Save, Save, and Save Some More

Always check whether or not there are any unsaved changes to configuration files, etc. prior to a reboot. Save early and safe often!
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chkconfig Command Examples for Red Hat and CentOS
Filed under: Technical Support

chkconfig is a command for checking and updating runlevel information for system services. For a primer on runlevels, check out our tutorial: Linux Runlevels Explained.

Pre-Flight Check
  • These instructions are intended specifically for checking and updating chkconfig.
  • I’ll be working from both a Liquid Web Core Managed CentOS 7 server, and I’ll be logged in as root.

(more…)




Information on CVE-2014-6271 and CVE-2014-7169 Bash Vulnerabilities (Shell Shock)

On September 24th, a vulnerability was reported in the GNU Bourne-Again-Shell (BASh, or Bash), specifically a flaw with how Bash processes values of environment variables, that allows remote code execution of varying types in many common configurations. The overall risk is severe due to bash being configured for use, by default, on most Linux servers.

While Liquid Web immediately began working to proactively patch this vulnerability, some servers may remain vulnerable depending on their update settings or other unforeseen intervening factors. Thus, we’ve provided the instruction below.

To Summarize:

  • This flaw exploits Bash, a Unix command-line shell run by default on most Linux servers.
  • Allows for remote code execution, and many types of command-line based attacks.
  • A patch is available, and your server can be easily updated.
  • We have tutorials on How to Update Bash on Red Hat and CentOS and How to Update Bash on Debian and Ubuntu.
  • Test the vulnerability of your server with the information below.

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How to Update Bash on Red Hat and CentOS
Filed under: Technical Support
Pre-Flight Check
  • These instructions are intended specifically for updating Bash on Red Hat and CentOS.
  • I’ll be working from both a Liquid Web Core Managed CentOS 6 server and a Liquid Web Self Managed CentOS 7 server, and I’ll be logged in as root.

(more…)




How to Update Bash on Debian and Ubuntu
Filed under: Technical Support
Pre-Flight Check
  • These instructions are intended specifically for updating Bash on Debian and Ubuntu.
  • I’ll be working from both a Liquid Web Core Managed Ubuntu 14.04 server and a Liquid Web Self Managed Debian 7.4 server, and I’ll be logged in as root.

(more…)




How to Update Bash on CentOS 6 and CentOS 7
Filed under: Technical Support
Pre-Flight Check
  • These instructions are intended specifically for updating Bash on CentOS 6 and CentOS 7.
  • I’ll be working from both a Liquid Web Core Managed CentOS 6 server and a Liquid Web Self Managed CentOS 7 server, and I’ll be logged in as root.

(more…)




How to Install lsyncd on CentOS 7
Filed under: Technical Support

lsyncd is an rsync-based tool that monitors specified directories (including subdirectories) for updates and modifications, then syncs those changes to a specified destination.

Pre-Flight Check
  • These instructions are intended specifically for installing the lsyncd on CentOS 7.
  • I’ll be working from a Liquid Web Core Managed CentOS 7 server, and I’ll be logged in as root.

(more…)




How to Install lsyncd on CentOS 6
Filed under: Technical Support

lsyncd is an rsync-based tool that monitors specified directories (including subdirectories) for updates and modifications, then syncs those changes to a specified destination.

Pre-Flight Check
  • These instructions are intended specifically for installing the lsyncd on CentOS 6.
  • I’ll be working from a Liquid Web Core Managed CentOS 6 server, and I’ll be logged in as root.

(more…)




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