The Issue When running multiple httpd instances on a single host (i.e. as suggested by this post) that has SELinux enabled and in enforcing mode, using a single logrotate configuration for log rotation may fail when a postrotate script similar to the following is used: postrotate /bin/systemctl reload httpd*.service > /dev/null 2>/dev/null || true endscript The "systemctl reload httpd*.service" command works from command line, however, SELinux policy prevents logrotate listing … [Read more...] about How to configure logrotate for multiple httpd instances
Linux
How to configure multiple instances of Apache (httpd) on the same server
The Ask We need to start multiple web server on the same box (CentOS/RHEL). How to implement two httpd servers on a single RHEL machine? Is it supported to run multiple instances of httpd on one RHEL system? The Answer CentOS/RHEL distributions don't inherently provid a convenient way of doing this, though it is possible to configure manually. There are different ways to configure multiple instances, one option is to: Duplicate http configuration files,pid,lockfile etc. 1. Duplicate … [Read more...] about How to configure multiple instances of Apache (httpd) on the same server
How to configure systemd to manage custom instance of httpd on RHEL 7
The Ask Once a new instance of httpd has been configured ( How do I configure multiple instances of Apache (httpd) on the same server? for a sample method of doing this configuration ) the process to create the systemd configuration would be the following: 1. Duplicate the systemd unit files of the standard httpd service: # cp -p /lib/systemd/system/httpd.service /lib/systemd/system/httpd.myinstance.service # cp -p /etc/sysconfig/httpd /etc/sysconfig/httpd.myinstance 2. Edit … [Read more...] about How to configure systemd to manage custom instance of httpd on RHEL 7
Red Hat Enterprise Linux Release Dates
The tables below list the major and minor Red Hat Enterprise Linux updates, their release dates, and the kernel versions that shipped with them. Red Hat does not generally disclose future release schedules. To find your Red Hat Enterprise Linux release please: $ cat /etc/redhat-release For Example: $ cat /etc/redhat-release Red Hat Enterprise Linux Server release 6.6 (Santiago) To find your kernel version please: $ uname -a For Example: $ uname -a Linux geeklab … [Read more...] about Red Hat Enterprise Linux Release Dates
Using cut on Linux Terminal
The cut command The cut command is most often used to select single columns of data from input separated by a single character, such as an /etc/passwd file. For example, the cut command is used to extract specified columns/characters of a piece of text, which is given as follows: -c: Specifies the filtering of characters -d: Specifies the delimiter for fields -f: Specifies the field number Cut Command Examples The following are a few examples that show the usage of the cut … [Read more...] about Using cut on Linux Terminal
Supported and Recommended File Systems on Linux
Purpose of this post is to give systems administrators an overview and a comparison of File Systems available on Linux. Linux File Systems One of the most interesting features of the Linux OS is its variety of file systems. File systems can be defined and built on a partition basis. VFAT, ext2, ext3, ext4 and Reiser file systems can co-exist on the same Linux system, along with several other file systems and raw partitions. Your choice of which one to use then becomes based on … [Read more...] about Supported and Recommended File Systems on Linux
What are the mount options to improve ext4 filesystem performance in Linux
The default mount options are deployed usually for maximum performance while maintaining safety for general usage. There are some mount options to optimize ext4 file system according to the needs of the target usage. barrier=0 This disables the write barriers in Journaling Block Device(JBD). Ext4 file system has barrier=1 by default where ext3 has barrier=0. Write barriers are used to enforce proper on-disk ordering of journal commits, but they will degrade the performance of the file … [Read more...] about What are the mount options to improve ext4 filesystem performance in Linux
How to protect a directory with .htaccess and htpasswd (Apache httpd)
The .htaccess file provides a way to make configuration changes on a per-directory basis. This file can contain one or more configuration directives. These directives will then be applied to the directory in which the .htaccess file exists and all its subdirectories. Follow the steps outlined below to protect a directory with .htaccess and htpasswd. The example server used below is CentOS/RHEL. 1. Use htpasswd password utility to create username/password combinations independent of the … [Read more...] about How to protect a directory with .htaccess and htpasswd (Apache httpd)
htpasswd: cannot open file /usr/bin/htpasswd for read/write access [openshift]
The Problem I am unable to add a user on the local htpasswd file using the htpasswd command. It looks like this file is locked by a process, but I am unable to determine how I can unlock (ran a lsof command to search for htpasswd). $ htpasswd /usr/bin/htpasswd garima htpasswd: cannot open file /usr/bin/htpasswd for read/write access $ htpasswd -c /usr/bin/htpasswd garima htpasswd: cannot open file /usr/bin/htpasswd for read/write access The Solution The htpasswd commands shall run as … [Read more...] about htpasswd: cannot open file /usr/bin/htpasswd for read/write access [openshift]
How to Add Network Gateway or Static Route on CentOS/RHEL 6, 7
The entire purpose of networking is to get traffic from point A to point B. When a computer requests information from another, packets are routed to the destination and then back. Sometimes, computers need a little guidance on how to get packets to the destination. This is known as routing. To assist with this, nodes utilize the concept of a routing table to help decide where packets should be sent given specific destinations. Let us see how to configure a static route in CentOS/RHEL 6,7 … [Read more...] about How to Add Network Gateway or Static Route on CentOS/RHEL 6, 7