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bufferoverflow skip to content primary menu home about me contact search search for: bufferoverflow setting up a ha galera cluster using maxscale august 25, 2016 tully leave a comment this is a guide meant to provide you with a simple, highly available, and balanced mysql cluster that works and is resilient as hell. first, you’ll need five machines or five vm’s. i’m running ubuntu 14.04 so to follow the guide you should as well. i’ll be notating each galera box as node1-3 and each maxscale box as ha1-2. we need to add the galera repository. ssh into all three nodes and run the following root@galera01:~# sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys cbcb082a1bb943db root@galera01:~# echo 'deb http://mirror.jmu.edu/pub/mariadb/repo/5.5/ubuntu trusty main' | sudo tee /etc/apt/sources.list.d/galera.list root@galera01:~# sudo apt-get update once that’s done we need to install galera and set the root password root@galera01:~# sudo apt-get install mariadb-galera-server galera if the service started automatically make sure and stop it now on all nodes. otherwise what we do in later steps will require you to force it to die. root@galera01:~# sudo service mysql stop next edit /etc/mysql/my.cnf. i’m going to set the bind address to 0.0.0.0 so it’ll work for anyone but you can lock it down to a specific ip if you want. we can’t use loopback because the cluster members have to talk to one another. i’m also going to enable the slow log. bind-address = 0.0.0.0 slow_query_log=1 now, we need to create /etc/mysql/conf.d/cluster.cnf. the important variables in the file are the bind-address which once again is set to 0.0.0.0 for any ip. the wsrep_cluster_name can be anything you’d like but should be the same on all nodes of the cluster. the wsrep_cluster_address field should contain ip’s for all 3 of your nodes as shown. the wsrep_sst_method i use is rsync. simply put, the gcache size is a cache of replication actions that need to be performed on a node that goes down temporarily and this will function over ist. if you go over your gcache you’ll use sst and rsync. this will lock the donor node until the failed node comes back up. you could use mysqldump but it’s slower. lastly, your wsrep_node_address should be the node’s address you’re editing the file on. the same goes for the wsrep_node_name. i’ve added the last line wsrep_retry_autocommit because there are occasions where a cluster wide deadlock happens when another node is writing to a table that another node is also trying to write to. these only apply to autocommit statements. i chose to include this because i have seen occurrences where an application encounters a deadlock and the driver, despite being told “retry the transation”, simply errors out. [mysqld] query_cache_size=0 binlog_format=row default-storage-engine=innodb innodb_autoinc_lock_mode=2 query_cache_type=0 bind-address=0.0.0.0 # galera provider configuration wsrep_provider=/usr/lib/galera/libgalera_smm.so #wsrep_provider_options="gcache.size=32g" # galera cluster configuration wsrep_cluster_name="my_cluster" wsrep_cluster_address="gcomm://192.168.1.130,gcomm://192.168.1.198,gcomm://192.168.1.167" # galera synchronization congifuration wsrep_sst_method=rsync wsrep_sst_auth=galerauser:secretsdontmakefriends # galera node configuration wsrep_node_address="192.168.1.130" wsrep_node_name="galera01" wsrep_retry_autocommit=4 next, we need to copy /etc/mysql/debian.cnf from the first node and replace the contents of the file with every other node. you can simply copy/paste or scp the file over. it says in caps “do not touch” but i’m an adult and can do what i want. the main piece we need syncd is the password= field. we’ll bootstrap every other node off the first so it will work fine. don’t copy and paste mine below, i’m simply including it so you can reference what it looks like. # do not copy this - use the one on your first node #automatically generated for debian scripts. do not touch! [client] host = localhost user = debian-sys-maint password = qllrzgop4zidvsvf socket = /var/run/mysqld/mysqld.sock [mysql_upgrade] host = localhost user = debian-sys-maint password = qllrzgop4zidvsvf socket = /var/run/mysqld/mysqld.sock basedir = /usr create a .my.cnf file in /root if you don’t feel like typing passwords [client] user=root password="bananah4mmock" [mysql] user=root password="bananah4mmock" run mysql_secure_installation on the first node. root@galera01:~# mysql_secure_installation note: running all parts of this script is recommended for all mariadb servers in production use! please read each step carefully! in order to log into mariadb to secure it, we'll need the current password for the root user. if you've just installed mariadb, and you haven't set the root password yet, the password will be blank, so you should just press enter here. enter current password for root (enter for none): ok, successfully used password, moving on... setting the root password ensures that nobody can log into the mariadb root user without the proper authorisation. you already have a root password set, so you can safely answer 'n'. change the root password? [y/n] n ... skipping. by default, a mariadb installation has an anonymous user, allowing anyone to log into mariadb without having to have a user account created for them. this is intended only for testing, and to make the installation go a bit smoother. you should remove them before moving into a production environment. remove anonymous users? [y/n] ... success! normally, root should only be allowed to connect from 'localhost'. this ensures that someone cannot guess at the root password from the network. disallow root login remotely? [y/n] ... success! by default, mariadb comes with a database named 'test' that anyone can access. this is also intended only for testing, and should be removed before moving into a production environment. remove test database and access to it? [y/n] - dropping test database... ... success! - removing privileges on test database... ... success! reloading the privilege tables will ensure that all changes made so far will take effect immediately. reload privilege tables now? [y/n] ... success! cleaning up... all done! if you've completed all of the above steps, your mariadb installation should now be secure. thanks for using mariadb! stop mysql on all nodes. then, on the first node we’ll start our new cluster. root@galera01:~# service mysql stop * stopping mariadb database server mysqld [ ok ] root@galera01:~# service mysql start --wsrep-new-cluster * starting mariadb database server mysqld [ ok ] now, on the other nodes we will simply start the mysql service. it’ll bootstrap off the first automatically. root@galera02:~# service mysql stop * stopping mariadb database server mysqld [ ok ] root@galera02:~# service mysql start * starting mariadb database server mysqld [ ok ] now, since we were lazy and created a .my.cnf file just run mysql -u root and get dropped into a shell. we’re going to create a database and watch it get replicated to the other nodes root@galera01:~# mysql -u root welcome to the mariadb monitor. commands end with ; or \g. your mariadb connection id is 30 server version: 5.5.51-mariadb-1~trusty-wsrep mariadb.org binary distribution, wsrep_25.14.r9949137 copyright (c) 2000, 2016, oracle, mariadb corporation ab and others. type 'help;' or '\h' for help. type '\c' to clear the current input statement. mariadb [(none)]> create database replicateme; query ok, 1 row affected (0.00 sec) head over to another node and log into mysql and run a show databases. you’ll see that our database was replicated just fine. root@galera02:~# mysql -u root welcome to the mariadb monitor. commands end with ; or \g. your mariadb connection id is 31 server version: 5.5.51-mariadb-1~trusty-wsrep mariadb.org binary distribution, wsrep_25.14.r9949137 copyright (c) 2000, 2016, oracle, mariadb corporation ab and others. type 'help;' or '\h' for help. type '\c' to clear the current input

URL analysis for bufferoverflow.io

https://bufferoverflow.io/asterisk-setup/
https://bufferoverflow.io/gpu-passthrough/#comment-2865
https://bufferoverflow.io/asterisk-setup/#respond
https://bufferoverflow.io/gpu-passthrough/#comment-11237
https://bufferoverflow.io/category/gpu-passthrough/
https://bufferoverflow.io/2016/08/
https://bufferoverflow.io/#content
https://bufferoverflow.io/spamming-with-asterisk/#comments
https://bufferoverflow.io/category/sysadmin/
https://bufferoverflow.io/contact/
https://bufferoverflow.io/open-plex-servers/#comments
https://bufferoverflow.io/gpu-passthrough/#comments
https://bufferoverflow.io/open-plex-servers/#comment-4491
https://bufferoverflow.io/category/vulnerabilities/
https://bufferoverflow.io/2016/01/

Whois Information

Whois is a protocol that is access to registering information. You can reach when the website was registered, when it will be expire, what is contact details of the site with the following informations. In a nutshell, it includes these informations;

Domain Name: BUFFEROVERFLOW.IO
Registry Domain ID: D503300000040393572-LRMS
Registrar WHOIS Server: whois.namecheap.com
Registrar URL: www.namecheap.com
Updated Date: 2018-04-03T06:11:16Z
Creation Date: 2015-05-03T06:29:02Z
Registry Expiry Date: 2019-05-03T06:29:02Z
Registrar Registration Expiration Date:
Registrar: NameCheap, Inc
Registrar IANA ID: 1068
Registrar Abuse Contact Email: [email protected]
Registrar Abuse Contact Phone: +1.6613102107
Reseller:
Domain Status: ok https://icann.org/epp#ok
Registrant Organization: WhoisGuard, Inc.
Registrant State/Province: Panama
Registrant Country: PA
Name Server: NS1.LINODE.COM
Name Server: NS2.LINODE.COM
Name Server: NS3.LINODE.COM
Name Server: NS4.LINODE.COM
DNSSEC: unsigned

>>> Last update of WHOIS database: 2019-02-10T21:36:54Z <<<

For more information on Whois status codes, please visit https://icann.org/epp

Access to WHOIS information provided by Internet Computer Bureau Ltd. ("ICB") is provided to assist persons in determining the contents of a domain name registration record in the ICB registry database. The data in this record is provided by ICB for informational purposes only, and ICB does not guarantee its accuracy. This service is intended only for query-based access. You agree that you will use this data only for lawful purposes and that, under no circumstances will you use this data to(i) allow, enable, or otherwise support the transmission by e-mail, telephone, facsimile or other electronic means of mass, unsolicited, commercial advertising or solicitations to entities other than the data recipient's own existing customers; or (ii) enable high volume, automated, electronic processes that send queries or data to the systems of Registry Operator, a Registrar, or ICB or its services providers except as reasonably necessary to register domain names or modify existing registrations. UK privacy laws limit the scope of information permitted for certain public access. Therefore, concerns regarding abusive use of domain registrations in the ICB registry should be directed to either (a) the Registrar of Record as indicated in the WHOIS output, or (b) the ICB anti-abuse department at [email protected].

All rights reserved. ICB reserves the right to modify these terms at any time. By submitting this query, you agree to abide by these policies

The Registrar of Record identified in this output may have an RDDS service that can be queried for additional information on how to contact the Registrant, Admin, or Tech contact of the queried domain name.

SERVERS

  SERVER io.whois-servers.net

  ARGS bufferoverflow.io

  PORT 43

  TYPE domain

DOMAIN

  NAME bufferoverflow.io

NSERVER

  NS5.LINODE.COM 162.159.24.25

  NS3.LINODE.COM 162.159.25.129

  NS4.LINODE.COM 162.159.26.99

  NS1.LINODE.COM 162.159.27.72

  NS2.LINODE.COM 162.159.24.39

  REGISTERED yes

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