General :: Fail Over Scenario In MySQL Replication?
Sep 12, 2010
i had configured a MySQl Replication Server with 2 DB Servers.Now we are planning to implement a failover Scenario.If Master fails The slave should act as a Master and we have a addition server.It will be going to act as slve.i had mentioned the points below..
Replication
(Master Server)----->----(Slave Server)-----------(Additional Server)
DBS 1 DBS 2 DBS 3
1.Replication is made between Master (DBS 1) and Slave (DBS 2) (successfully done)
2.If Master (DBS 1) failed Slave (DBS 2) should act as a Master and Additional Server (DBS 3) needs to be Slave
3.Whenever Orginal Master (DBS 1) became online the current Master ie ..Slave (DBS 2) should go back to Slave position and all lost data will be replicated to Master DBS 1.
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Sep 15, 2010
I had Configured a MySQL Master-Slave replication.It seems that the binary logs steals so much space of My storage.
i.)My Master
show master status;
+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000144 | 475823 | | |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)
ii.)My Slave.
mysql> SHOW SLAVE STATUSG;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 10.277.55.141
[code]....
If i remove all binary files up tp mysql-bin.000144 using "PURGE",will it affect my existing database/any data loss.
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Oct 15, 2010
My MySQL replication slave failed,while reading a large size table from master.Thhe information from error.logError 'Unknown table engine 'InnoDB'' on query. Default database: 'test'. Query: I am sure that table is a Big size table..
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Apr 18, 2011
I am trying a scenario for calling a shell script when ever a trigger is called. Can some one guide me how to achieve this scenario. Also it should passes the value from the table to the shell script. Can some one explain me along with the example.
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Apr 5, 2010
If I have 2 MySQL server and I want to replicate their database to only 1 server, is it possible? I cannot afford to have master-to-master only because I still need to replicate one more machine but I do not have anymore more machine for replication so I'm thinking if these 2 MySQL server can be replicate to only 1 machine. If this is not possible, I guess I've no choice but to have two mysql daemon on that machine
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Sep 27, 2010
Might this is silly question but I am not much familiar to database.I am doing master slave Mysql replication for load balancing. On master server different database has different user privileges. I create backup using mysqldump command and restore on slave server instead of using load data from master; command.When i replicate database from master to slave will i require to set user privileges same as master ?One more question: How to lock all database in mysql?
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Aug 8, 2011
I have two computers (one tower, one laptop). On both the computers, I have apache & PHP & mysql running, so i can program/script anywhere I like. With a simple sync'ing program, the PHP scripts are synced between the PC's, thought the databases arent. Therefor I'm looking for a method to sync (replicate) the databases between the PC's. thought after setting up some configuration, i'm stuck... now with how to, but what to
Option 1) Multi-master replication between the PC and the laptop. With this setup, the database can ONLY sync once both the devices are turned on. Also it can only sync if they are turned on on my LAN, since they do not have an external static IP address. if I turn on both PC's on my LAN, with static IP's (from the DHCP server), this option will work. Thought, I basically never have both pc's turned on in my own home... cuz i can use only one at the time anyway.So I was thinking of another setup
Option 2) Multi-master replication with: online Server, PC and Laptop. The server basically contains the most up to date database. for example, the laptop updates the server and the server can update the PC later, once the PC is turned on. Also the other way around, the PC can update the server which can than update the Laptop.
There is, if i'm correct, only one problem: the only multi master replications setups I found, use a circulair setup... (1 updates 2, 2 updates 3, 3 updates 1) What I need is to have the PC update the server, but ALSO have the server update the PC (same for the laptop)
than there is another (little) problem: the PC and laptop cannot be reached from behind the modem, nor do they have a static IP. My question: Is it possible to sync the server with the laptop (that has no static IP), the laptop with the server (that has a static IP), and the same for the PC
PC <====> Server <====> Laptop
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Jun 21, 2010
I am looking into setting up replication in a production environment but currently this is on two test machines. I am following the documentation at [URL] but I am unable to get past "16.1.1.10 Setting the Master Configuration on the Slave". When I do the CHANGE MASTER TO I am getting a syntax error for some reason. What am I doing wrong? These servers run "CentOS release 5.5 (Final)" and "MySQL 5.0.77-log Source distribution" installed via yum. The only changes from default are that I created a single database on the master before doing the table lock and dump, then everything else has been done exactly to what the documentation states, but is still failing.
The option skip-networking is not in the config file on either server and neither one runs SELinux or any firewall.
mysql> CHANGE MASTER TO
-> MASTER_HOST='192.168.1.220'
-> MASTER_USER='repl'
-> MASTER_PASSWORD='removed'
[Code]....
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Aug 12, 2010
I started over combining the first parts of this guide: [URL]..ubuntu8.04 (Only the first few parts in terms of configuration and naming). Then I used this guide: [URL]..Surprisingly enough all steps worked.
1. Now I need to set up LAMP servers with MySQL master/slave replication and Apache rsync.
2. Next i need to add BIND to both my Load Balancers with master/slave backup and replication...
Are there any guides to look at to follow on these? Can tou point me to the right direction for BIND with replication.
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Nov 6, 2013
I have mysql installed successfully. I can insert rows into my table using phpMyAdmin. I can successful retrieve those rows in PHP with a select statement. However, I cannot insert or update rows from PHP. I get no error messages and everything appears to be working okay, just no results in mysql table.
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Nov 20, 2010
Today I was trying to upgrade mysql and php.PhP went well, thats at the latest version, but the mysql went to 5.5x from REMI. This killed all my websites, no DB and worse.Well I typed the wrong this (totally my fault - serious EPIC FAIL)i typed yum remove mysql not downgrade...This removed plesk and a load of other stuff, and now im screwed.
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Feb 24, 2010
i do wish to read study learn from linux world. sites to refer always for command, practice,tutorials etc.say like replication data os level from 1 pc to other pc,without using any outside linux software, only os level, linux to linux, linux to windows/macchannel bonding, using 2 network ethernet card, double the speed of network card and failover netowkr card alsosyncronize data 1pc to 2pc
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Jun 2, 2010
i am using liferay5.2(mysql included in the download pack) on fedora. while liferay is working fine but i cannot connect to mysql.i am getting the error
[
[root@localhost ~]# ln -s /var/lib/mysql/mysql.sock /tmp
[root@localhost ~]# /etc/init.d/mysqld start
Timeout error occurred trying to start MySQL Daemon.
[code]....
i didnt find the mysql.sock file in the location /var/lib/mysql/mysql.sock. i cannot find the portal-ext.properties file also to make intial settings.
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Nov 29, 2010
I configured a master DNS server 192.168.2.10 working OK. After that I configure a DNS Slave Server (92.168.2.11)the initial replication worked fine. This is test environment for my certification. I see how the zones from my master are transferred
zones in Master
training.com.db
transferred zone to my slave when I started named service
sec.training.com.db
That's Ok but I added some IPs to resolve to my master zone
webserver IN A 192.168.2.30
fileserver IN A 192.168.2.31
I restart/reload named on master and after that I go to slave and restart/reload but zones wuth the new values are not replicated. How long does it take for slave to take the changes from master? how is the procedure manual or automatic? I see If I go to slave and delete sec.training.com and restart named the zone with the changes is transferred but that is very manual... I am including my DNS Configuration so you can take a look.
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Jun 5, 2010
I am IT Manager. Currently I am responsible for a mostly IBM shop, running a mix of AIX, OS/400. VMware, and Windows.
My P-series running AIX and Oracle and my AS/400 both back up to tape drives daily.
But my VMware system is not being backed up, the virtual machines are, but my tape drive just broke down.
I just ordered a server grade machine with an i5 CPU, running 3 2TB SATA drives in RAID5, this is going to be my new backup server.
I am hoping I can put Linux on it, and some sort of open source file replications, real time backup software that will back up my Windows servers, and my Windows desktops in real time.... any sort of animal exist?
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Mar 19, 2011
We are hosting Webserver using Apache -tomcat , in our company we are following this way for our every new enhancement in production server.for example if the developers move any new code moved to the server means that time we'll do 1.first check the time / date2. mod_jk log which domain currently accessing our client,3. and check the last 20 lines of the http_access log in http access log if the domain accessing from our side means that means we are using two static ip , in the http_access log in the last 20 lines our static ip(ex 122.65.77.88, 122.65.77.89) displayed means we then4. stop the tomcat and killall the java process and again restart the tomcat process.elsein the http_access log display any other ip means we check the time/date if the date/time is current date/time means we just hold the server restart for few mins otherwise we restart the server.Note these all scenario happens while minor server push......for this scenario is it possible to write the script
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Nov 27, 2010
I installed bonnmotion 1.4 but when I try to generate a scenario, i get the error msg
bm: command not found.
if I replace bm by ~/Bureau/bonnmotion-1.4/bin/bm , I get This error msg :
Exception in thread "main" java.lang.NoClassDefFoundError: edu/bonn/cs/iv/bonnmotion/run/BM
Caused by: java.lang.ClassNotFoundException: edu.bonn.cs.iv.bonnmotion.run.BM
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Plsss any idea on how to resolve this?
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Aug 27, 2010
I use bind 9.3.4 on RedHat 5.3, and I try to create some simple DNS related scenario. I have two DNS servers. One of them serves rodnower.org. zone and an other service web.rodnower.org. zone. The parent has glue record to child. I sussessfully query all rodnower.org. records, but failed to get data from subdomain. So here relevant data from namd.conf of parent zone:
Code:
view "main" {
zone "rodnower.org" IN {
type master;
file "rodnower.org.zone";
[Code]...
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Apr 27, 2010
I want to cram as much speed as possible from my EEEPC 1005 from the current scenario
-mostly web apps through Chrome/FF
-desktop apps used mainly terminal, VLC, remote desktop => don't want fany interface, just fast and lightweight
-my home folder only 2gb => don't really need the hard drive
-I want fast boot time!
I really don't want to mess with my hardware and replace the hard drive with SSD. But I could run linux from USB memory (they're said to run faster than the casual SD memory cards). So my questions to you are
-which USB memory, what speed is minimum?
-is Ubuntu maybe overkill, should I go for the smaller distros? Most importantly - will I gain any speed from that???
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Jul 16, 2009
So, I had fun with this one the past week. I had an FC11 system running just fine. Then one day it would not boot - it was hung somewhere inside the init script of the initrd image. CTRL-ALT-DEL would reboot the system. Using grub editor, I could temporarily delete the initrd line and boot into the system OK. But what was going on?
mkinitrd was of no help to me. I even did a yum update, which got a new kernel, which also generated a new initrd - no joy. I extracted the initrd file system and edited the init script. I eventually hit on this tidbit: If I commented out this line:
daemonize --ignore-missing /bin/plymouthd and rebuild the initrd image - the system would finally at least tell me what the problem was: mount failed for selinuxfs on /selinux. No such file or directory.
So, I examine the root (the real root, not the initrd temporary root) - and sure enough, no /selinux. I make one and reboot. The system goes into a "targeted policy relabel" operation, reboots, and I am back in business - even with my original, unmodified, initrd.
I have no idea what happened to my /selinux directory, but I think the initrd "init" script needs to check for this directory's existance, and make it if necessary. Or at least report that it isn't there. In FC11 right now the system just HANGS without this directory being present, without any clue as to what the problem is!
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Aug 7, 2010
How do I create a new mysql user and a mysql database at the shell prompt?
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Feb 19, 2010
Mysql starting problem after changing mysqladmin password.I tried all the solutions available on forums, but not solve the problem.At last I restored the mysql db backup, this make mysql service start, but till other databases not showing all tables.
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May 13, 2011
I have install mysql on my fedora12. My different mysql server is located in us. I want to check health status and hits per seconds everything. Is it possible with mysql-administrator command.
now a these days i am connect through ssh and excuting below command
#mytop mysql -u root -p <passwd>
In my mysql db i have added the userip & passwd (allowed the privileages for that ip)
If i use mysql-administrator i am getting below error
MySQL Error Nr. 2003
Can't connect to MySQL server on '66.98.152.64' (111)
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Jun 14, 2011
I have tried many different ways to interact with the mysql to reset the root mysql pass. This is what I got to right now
Code:
#!/bin/sh
newpass=$1
service mysqld stop
mysqld_safe --skip-grant-tables --skip-networking &
echo "use mysql;" >> /tmp/mysql_pass_reset.txt
echo "update user set password=PASSWORD("$newpass") where User="root";" >> /tmp/mysql_pass_reset.txt
[Code]...
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Jun 7, 2011
I think this goes here, but I'm not sure. I decided that XAMPP had been troublesome enough. MySQL never worked. So I decided to instal the LAMP stack offered by YaST. I went about installing it thinking that it would all work. But it seems that I was wrong. So I try to start mysql, and here's what I get:
Code:
the-matrix:~ # mysql start
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/mysql/mysql.sock' (2) or
Code:
the-matrix:~ # rcmysql start
Starting service MySQL warning: /var/mysql/mysql.sock didn't appear within 30 seconds
chmod: cannot access `/var/run/mysql/mysqld.pid': No such file or directory
[Code]...
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Apr 13, 2010
I'm running RHEL 5.5 on two workstation for test DRBD and I get something that sound strange ...[URL] Quote:Protocol C. Synchronous replication protocol. Local write operations on the primary node are considered completed only after both the local and the remote disk write have been confirmed. As a result, loss of a single node is guaranteed not to lead to any data loss. Data loss is, of course, inevitable even with this replication protocol if both nodes (or their storage subsystems) are irreversibly destroyed at the same time. By far, the most commonly used replication protocol in DRBD setups is protocol C.
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Jan 18, 2011
I have a fedora 8 server and I just wanted to install fedora directory server I got it install and running, but I'm unable to check the replication and also it seems that I has no database when I user fedora-console-idm.[URL].. Also the same thing happens at the web tool. Any ideas? I think there is no db set, but I have no idea how to do this on fedora-ds. I'm new to it.
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Feb 10, 2011
I am using Debian as mail server and proxy server. I need to configure one backup server for the same. Mainly I need to replicate/sync the files on both machines. So I can avoid the failure time.
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May 6, 2010
How to directory replication between 2 or more servers?
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Mar 1, 2011
I have been scripting Inotify to work as file replication.It works very well for casual use when editing or uploading files. But I have to make sure it stands up against a "tar bomb" when we install a new package. EG: tar -xzf really_big_php_project.tar.gz
Code:
#!/bin/sh
# get the current path
[code]....
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