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Displaying posts with tag: Linux (reset)
MySQL script automation and security

After MySQL installation, If you don’t have any enterprise level / any GUI interface for monitoring, backup then one of the option is, write your own scripts to automate these tasks.
In this Blog post, we are going to see few monitoring and backup scripts with covering common security issues.

Credential security

Following is a simple script, which will monitor MySQL service. In case MySQL …

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MySQL service : Unable to setup unix socket lock file.

How to solve mysqld service restart problem for above error?

Problem :
I was adding shell and home directory for mysql user,executed following cmd,

shell> usermod -m -d /home/mysql -s /bin/bash mysql

If mysql is running and process running with mysql , we need to stop mysql otherwise it will throw an error like usermod: user mysql is currently used by process 27768

After stopping MySQL service and adding shell and homedir for mysql user, at the time mysqld service startup it started throwing error.

shell> service mysqld restart
Redirecting to /bin/systemctl restart mysqld.service
Job for mysqld.service failed because the control process exited with error code. See "systemctl status mysqld.service" and "journalctl -xe" for details.
Shell> systemctl status mysqld.service

● mysqld.service - MySQL Server
Loaded: loaded …
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Moving with SQL Server to Linux? Move from SQL Server to MySQL as well!

Over the recent years, there has been a large number of individuals as well as organizations who are ditching the Windows platform for Linux platform, and this number will continue to grow as more developments in Linux are experienced. Linux has for long been the leader in Web servers as most of the web servers run on Linux, and this could be one of the reasons why the high migration is being experienced.

Install cx_Oracle for Python

This shows you how to install the cx_Oracle library for Python 2.7 on Fedora Linux. If Fedora has it on the server you can download it with the following yum command:

yum install -y cx_Oracle-5.2.1-11g-py27-1.x86_64.rpm

Currently, you’ll get the following failure because it’s not available in the Fedora repository:

Loaded plugins: langpacks, refresh-packagekit
mysql-connectors-community                                      | 2.5 kB  00:00:00     
mysql-tools-community                                           | 2.5 kB  00:00:00     
mysql56-community                                               | 2.5 kB  00:00:00     
pgdg93                                                          | 3.6 kB  00:00:00     
updates/20/x86_64/metalink                                      | 2.3 kB  00:00:00     
No package cx_Oracle-5.2.1-11g-py27-1.x86_64.rpm available.
Error: Nothing to do

You can download the …

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MySQL 5.7 and administration

MySQL 5.7 improved as compare to previous releases in terms of transnational capabilities, performance with high load, high Availability, Security and it’s defaults.

Check my blog post : MySQL 5.7 features

This blog post will describe End to End implementation of MySQL on Linux distributions Which will cover MySQL Installation, configuration and administration in production environment with proper configuration. So you can start using your application by implementing following setup and in future you can change it if requires.

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vm.swappiness and OOM in RHEL6

The behavior of vm.swappiness was always a bit confusing for novice linux users, as setting vm.swappiness to 0 would not completely disable swapping in the system during a memory crunch. vm.swappiness would only affect the agressiveness of swapping.

Following upstream commit tried to give more control to parameter. This commit tried to avoid swapping completely when vm.swappiness is set to 0.

commit fe35004fbf9eaf67482b074a2e032abb9c89b1dd
Author: Satoru Moriya
Date: Tue May 29 15:06:47 2012 -0700
mm: avoid swapping out with swappiness==0

With above commit, setting vm.swappiness to “0” instructs the kernel not to initiate swapping until the amount of free and file-backed pages is less than the high water mark in a memory zone. In other words, it tries to reclaim as much memory that can be reclaimed, before swapping starts.
This greatly reduced the chances of swapping.

When this …

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Installing MariaDB MaxScale the hard way

If you are like me (let's for everyones sake hope you are not, though) you like to do things the hard way, in particular when it comes to testing things. For example when installing things on your Linux box, just to try them out, you might not want to do a yum install an rpm -ivh or an apt-get to have some files spread all over your system, instead you want to tar xvf some tarball and possibly, if you are in a good mood or you want to be a nice so you get some gifts for christmas or maybe because it is just that day, you unpack that tarball in /usr/local instead of in /home/bofh/junk. And this will usually get you in some trouble, but as we have already determined that we are truly bad (maybe we should get a tattoo or two also, or is the right to death-metal antics reserved for IT security personel only? Sure seems so) we can ignore that and get to work.

Here I will show you how to install …

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Running Percona XtraDB Cluster nodes with Linux Network namespaces on the same host

This post is a continuance of my Docker series, and examines Running Percona XtraDB Cluster nodes with Linux Network namespaces on the same host.

In this blog I want to look into a lower-level building block: Linux Network Namespace.

The same as with cgroups, Docker uses Linux Network Namespace for resource isolation. I was looking into cgroup a year ago, and now I want to understand more about Network Namespace.

The goal is to both understand a bit more about Docker internals, and to see how we can provide network isolation for different processes within the same host. You might need to isolate process when running several MySQL or MongoDB instances on the same …

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Linux User-Group Console

This post shows you how to add the menu option and GUI to set users and groups. It’s quite a bit easier than mastering all the command-line syntax. It makes setting up the required user and group accounts for an Oracle Enterprise or MySQL database solution much easier.

You add the utility by calling the yum (Yellowdog Updater, Modified) utility like this:

yum installed -y system-config_users

You should see the following:

Loaded plugins: langpacks
adobe-linux-x86_64                                       |  951 B     00:00     
ol7_UEKR3                                                | 1.2 kB     00:00     
ol7_latest                                               | 1.4 kB     00:00     
Resolving Dependencies
--> Running transaction check
---> Package system-config-users.noarch 0:1.3.5-2.el7 will be installed
--> Processing …
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How to Setup MySQL Master-Master Replication

This article consolidates information from several sources into the format I use to setup MySQL Master/Master Replication. The beauty of Linux and open source is that there are many different ways to do this. Please take a look at my references and use them to accommodate any needs you may have.

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