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• Failed to connect from slave to master with error "error connecting to master (1045)"

  - by Victor Lin

  I try to setup replication from slave to the master. CHANGE MASTER TO MASTER_HOST = 'master', MASTER_PORT = 3306, MASTER_USER = 'repl', MASTER_PASSWORD = 'xxx'; And I did grant privileges to the user on master. I can connect with mysql command from slave machine to the master mysql -h master -u repl -p mysql> show grants; GRANT RELOAD, SUPER, REPLICATION SLAVE, CREATE USER ON *.* TO 'repl'@'xxx' IDENTIFIED BY PASSWORD 'xxx' mysql> select 1; +---+ | 1 | +---+ | 1 | +---+ 1 row in set (0.04 sec) As you can see, privileges are correct, connection works fine, but however, the connection for replication to master always failed. mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Connecting to master Master_Host: master Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: Read_Master_Log_Pos: 4 Relay_Log_File: slave-replay-bin.000002 Relay_Log_Pos: 4 Relay_Master_Log_File: Slave_IO_Running: Connecting Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 0 Relay_Log_Space: 107 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: NULL Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 1045 Last_IO_Error: error connecting to master 'repl@master:3306' - retry-time: 60 retries: 86400 Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 0 1 row in set (0.00 sec) Is this caused by different version of MySQL server? The version of master is 5.0.77, and the slave is 5.5.13. But all articles I could find tell me that it's okay to replicate from a newer slave to old master. How to solve this problem? -- Update -- I even try to upgrade the old MySQL, but still, the problem is not solved. mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Connecting to master Master_Host: master Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: master-bin.000007 Read_Master_Log_Pos: 107 Relay_Log_File: slave-replay-bin.000001 Relay_Log_Pos: 4 Relay_Master_Log_File: master-bin.000007 Slave_IO_Running: Connecting Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 107 Relay_Log_Space: 107 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: NULL Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 1045 Last_IO_Error: error connecting to master 'repl@master' - retry-time: 60 retries: 86400 Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 0 1 row in set (0.00 sec)

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• mysql replication 1x master, 1x slave

  - by clarkk

  I have just setup one master and one slave server, but its not working.. On my website I connect to the slave server and I insert some rows, but they do not appear on the master and vice versa.. What is wrong? This is what I did: Master: -> /etc/mysql/my.cnf [mysqld] log-bin = mysql-master-bin server-id=1 # bind-address = 127.0.0.1 binlog-do-db = test_db Slave: -> /etc/mysql/my.cnf [mysqld] log-bin = mysql-slave-bin server-id=2 # bind-address = 127.0.0.1 replicate-do-db = test_db Slave: terminal 0 > mysql> STOP SLAVE; // and drop tables Master: terminal 1 > mysql> CREATE USER 'repl_slave'@'slave_ip' IDENTIFIED BY 'repl_pass'; mysql> GRANT REPLICATION SLAVE ON *.* TO 'repl_slave'@'slave_ip'; mysql> FLUSH PRIVILEGES; mysql> FLUSH TABLES WITH READ LOCK; -- leave terminal open terminal 2 > shell> mysqldump -u root -pPASSWORD test_db --lock-all-tables > dump.sql mysql> SHOW MASTER STATUS; Slave: terminal 3 > shell> mysql -u root -pPASSWORD test_db < dump.sql terminal 0 > mysql> CHANGE MASTER TO mysql> MASTER_HOST='master_ip', mysql> MASTER_USER='repl_slave', mysql> MASTER_PASSWORD='repl_pass', mysql> MASTER_PORT=3306, mysql> MASTER_LOG_FILE='mysql-master-bin.000003', // terminal 2 > SHOW MASTER STATUS mysql> MASTER_LOG_POS=4, // terminal 2 > SHOW MASTER STATUS mysql> MASTER_CONNECT_RETRY=10; mysql> START SLAVE; mysql> SHOW SLAVE STATUS; Here is the slave status: Array ( [Slave_IO_State] => Waiting for master to send event [Master_Host] => xx.xx.xx.xx [Master_User] => repl_slave [Master_Port] => 3306 [Connect_Retry] => 10 [Master_Log_File] => mysql-master-bin.000003 [Read_Master_Log_Pos] => 106 [Relay_Log_File] => mysqld-relay-bin.000002 [Relay_Log_Pos] => 258 [Relay_Master_Log_File] => mysql-master-bin.000003 [Slave_IO_Running] => Yes [Slave_SQL_Running] => Yes [Replicate_Do_DB] => test_db [Replicate_Ignore_DB] => [Replicate_Do_Table] => [Replicate_Ignore_Table] => [Replicate_Wild_Do_Table] => [Replicate_Wild_Ignore_Table] => [Last_Errno] => 0 [Last_Error] => [Skip_Counter] => 0 [Exec_Master_Log_Pos] => 106 [Relay_Log_Space] => 414 [Until_Condition] => None [Until_Log_File] => [Until_Log_Pos] => 0 [Master_SSL_Allowed] => No [Master_SSL_CA_File] => [Master_SSL_CA_Path] => [Master_SSL_Cert] => [Master_SSL_Cipher] => [Master_SSL_Key] => [Seconds_Behind_Master] => 0 [Master_SSL_Verify_Server_Cert] => No [Last_IO_Errno] => 0 [Last_IO_Error] => [Last_SQL_Errno] => 0 [Last_SQL_Error] => )

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• Overwrite SOA expiry in a bind9 slave name server.

  - by Joachim Breitner

  I run a slave name server of a domain that I do not have full control over (i.e. changing the SOA is not possibly). The SOA specifies an expiry time of one week. For various reasons, I’d like to override that value on my specific slave server to something larger. Is there a way to do that? N.B: I know that for the refresh and retry fields, bind9 provides the options min-refresh-time, max-refresh-time, min-retry-time and max-retry-time to overrule the SOA, as mentioned in the documentation. For some reason this just does not inclucde expiry.

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• Sporadic crash of master-slave MySQL replication process

  - by obarshay

  Hello, I was wondering if someone has experienced this and can perhaps provide some insight into this issue. We have a plan-vanilla MySQL master-slave replication set up. The tables are MyISAM and the master can get quite read/write active. We use the slave instance to perform full daily backups in order to avoid bringing down the master server. The backup process does the following: STOP SLAVE SQL_THREAD mysqlhotcopy all tables START SLAVE SQL_THREAD Every once in a while (once a month or so) the replication breaks with varying error messages indicating a corrupt query or log file. Here's one that happened last night: mysql> show slave status \G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: server8.propreports.com Master_User: nexus8 Master_Port: 3306 Connect_Retry: 60 Master_Log_File: bin.000045 Read_Master_Log_Pos: 581644327 Relay_Log_File: relay.000086 Relay_Log_Pos: 94131 Relay_Master_Log_File: bin.000045 Slave_IO_Running: Yes Slave_SQL_Running: No Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 1064 Last_Error: Error 'You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '138070603'£' at line 1' on query. Default database: 'wtsdb'. Query: 'UPDATE fill SET clearing_fee='0.0E id='138070603'£' Skip_Counter: 0 Exec_Master_Log_Pos: 4164743 Relay_Log_Space: 577574251 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: NULL I follow the following procedure to recover from above error and resume replication: stop slave; change master to MASTER_LOG_POS = 4164743, MASTER_LOG_FILE = 'bin.000045'; start slave; We have multiple servers set up this way and they all sporadically stop replicating with a similar error. Any advice on how to resolve this would be greatly appreciated.

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• What's a good Java-based Master-Slave communication mechanism?

  - by plecong

  I'm creating a Java application that requires master-slave communication between JVMs, possibly residing on the same physical machine. There will be a "master" server running inside a JEE application server (i.e. JBoss) that will have "slave" clients connect to it and dynamically register itself for communication (that is the master will not know the IP addresses/ports of the slaves so cannot be configured in advance). The master server acts as a controller that will dole work out to the slaves and the slaves will periodically respond with notifications, so there would be bi-directional communication. I was originally thinking of RPC-based systems where each side would be a server, but it could get complicated, so I'd prefer a mechanism where there's an open socket and they talk back and forth. I'm looking for a communication mechanism that would be low-latency where the messages would be mostly primitive types, so no serious serialization is necessary. Here's what I've looked at: RMI JMS: Built-in to Java, the "slave" clients would connect to the existing ConnectionFactory in the application server. JAX-WS/RS: Both master and slave would be servers exposing an RPC interface for bi-directional communication. JGroups/Hazelcast: Use shared distributed data structures to facilitate communication. Memcached/MongoDB: Use these as "queues" to facilitate communication, though the clients would have to poll so there would be some latency. Thrift: This does seem to keep a persistent connection, but not sure how to integrate/embed a Thrift server into JBoss WebSocket/Raw Socket: This would work, but require a lot more custom code than I'd like. Is there any technology I'm missing? Edit: Also looked at: JMX: Have the client connect to JBoss' JMX server and receive JMX notifications for bidirectional comms.

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• Steps for MySQL DB Replication

  - by Manish Agrawal

  Following are the steps for MySQL Replication implementation on Linux machine: Pre-implementation steps for DB Replication:   1.    Identify the databases to be replicated 2.    Identify the tables to be ignored during replication per database for example log tables 3.  Carefully identify and replace the variables and paths(locations) mentioned (in bold) in the commands given below with appropriate values 4.  Schedule the maintenance activity in odd hours as these activities will affect all the databases on Master database server       Implementation steps for DB Replication:     1.    Configure the /etc/my.cnf file on Master database server to enable Binary logging, setting of server id and configuring of dbnames for which logging should be done. [mysqld] log-bin=mysql-bin server-id=1 binlog-do-db = dbname   Note: You can specify multiple DB in binlog-do-db by using comma separated dbname values like: dbname1, dbname2, …, dbnameN   2.    On Master database, Grant Replication Slave Privileges, by executing following command on mysql prompt mysql> GRANT REPLICATION SLAVE ON *.* TO slaveuser@<hostname> identified by ‘slavepassword’;   3.    Stop the Master & Slave database by giving the command      mysqladmin shutdown   4.    Start the Master database by giving the command      /usr/local/mysql-5.0.22/bin/mysqld_safe --user=user&     5.    mysql> FLUSH TABLES WITH READ LOCK; Note: Leave the client (putty session) from which you issued the FLUSH TABLES statement running, so that the read lock remains in effect. If you exit the client, the lock is released. 6.    mysql > SHOW MASTER STATUS;          +---------------+----------+--------------+------------------+          | File          | Position | Binlog_Do_DB | Binlog_Ignore_DB |          +---------------+----------+--------------+------------------+          | mysql-bin.003 | 117       | dbname       |                  |          +---------------+----------+--------------+------------------+ Note: Note this information as this will be required while starting of Slave and replication in later steps   7.    Take MySQL dump by giving the following command, In another session window (putty window) run the following command: mysqldump –u user --ignore-table=dbname.tbl_name -–ignore-table=dbname.tbl_name2 --master-data dbname > dbname_dump.db Note: When choosing databases to include in the dump, remember that you will need to filter out databases on each slave that you do not want to include in the replication process.     8.    Unlock the tables on Master by giving following command: mysql> UNLOCK TABLES;   9.    Copy the dump file to Slave DB server   10.  Startup the Slave by using option --skip-slave      /usr/local/mysql-5.0.22/bin/mysqld_safe --user=user --skip-slave&   11.  Restore the dump file on Slave DB server      mysql –u user dbname < dbname_dump.db   12.  Stop the Slave database by giving the command      mysqladmin shutdown   13.  Configure the /etc/my.cnf file on the Slave database server [mysqld] server-id=2 replicate-ignore-table = dbname.tablename   14.  Start the Slave Mysql Server with 'replicate-do-db=DB name' option.      /usr/local/mysql-5.0.22/bin/mysqld_safe --user=user --replicate-do-db=dbname --skip-slave   15.  Configure the settings at Slave server for Master host name, log filename and position within the log file as shown in Step 6 above Use Change Master statement in the MySQL session mysql> CHANGE MASTER TO MASTER_HOST='<master_host_name>', MASTER_USER='<replication_user_name>', MASTER_PASSWORD='<replication_password>', MASTER_LOG_FILE='<recorded_log_file_name>', MASTER_LOG_POS=<recorded_log_position>;   16.  On Slave Servers mysql prompt give the following command: a.     mysql > START SLAVE; b.    mysql > SHOW SLAVE STATUS;         Note: To stop slave for backup or any other activity you can use the following command on the Slave Servers mysql prompt: mysql> STOP SLAVE     Refer following links for more information on MySQL DB Replication: http://dev.mysql.com/doc/refman/5.0/en/replication-options.html http://crazytoon.com/2008/04/21/mysql-replication-replicate-by-choice/ http://dev.mysql.com/doc/refman/5.0/en/mysqldump.html

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• bind: Create Slave Zone Files

  <b>BeginLinux: </b>"The primary purpose of the slave server is to provide a backup to the primary master server should it go down for any reason."

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• MySQL replication hung after slave goes offline and comes back online again

  - by Ed Manet

  I have a master server and several slave servers replicating a single database. I am using in MySQL 5.0 in SLES 11. During fault tolerance testing I found that when the slave's network connection is broken (cable un-plugged) and then restored, replication hangs. It shows no errors and the slave appears to be running but the Read_Master_Log_Pos and Exec_Master_Log_Pos values do not match the log postion on the master server. The Slave_IO_State is "Waiting for master to send event". The Slave_IO_Running and Slave_SQL_Running values are both are "Yes". The Master_Log_File and Relay_Master_Log_File match. If I stop and start the slave or restart the mysql daemon, replication starts working again. Any ideas on what I can do about this?

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• mysql master-slave setup with synchronous replication

  - by imaginative

  I have a very trivial mysql master-slave setup going on between two servers. The problem is, replication is asynchronous, and this can cause issues (even on a low latency link), if the master server was to crash after a COMMIT before the replication thread from the slave was able to fetch the last bin log. Is there anyway to force mysql to do synchronous commits so that data consistency is guaranteed in a mysql-slave relationship?

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• Keyboard repeat on Input Director slave machine.

  - by ProfKaos

  I'm using Input Director as a software KVM to control my laptop from my desktop, and all is almost OK with the setup. However, key-presses on the master keyboard seem to repeat very easily on the slave, and it is close to impossible to type a word on the slave without getting repeated characters. I typed the word 'repeat' on the master keyboard and my editor on the slave captured the characters 'repeeaatt'. Both machines are Windows 7.

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• Mysql dump of slave w/o missing Master data

  - by zooooommmm

  I am fairly new to the whole replication process of mysql so this may be an easy question to answer. I have a master and and slave. I need to set up another slave so obviously I will need to make the dump from the current slave because I CAN NOT take the master offline for a second. How can I be sure that during the time I am making the dump of the current slave database that I do not miss any master data that is newly created over that time? Thanks all.

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• master to slave replication in mysql

  - by vijay

  i need master to slave replication in mysql so i am creating this procedure to change the master dynamically by procedure delimiter // CREATE PROCEDURE change_master( in host_ip varchar(50)) begin stop slave; CHANGE MASTER TO MASTER_HOST = host_ip, MASTER_PORT=3306, MASTER_USER='replication', MASTER_PASSWORD='slave'; start slave; end; // but i am getting a error. ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'host_ip, MASTER_PORT=3306, MASTER_USER='replication', MASTER_PASSWORD='slave'; s' at line 4 if i left it blank then fine eg. CHANGE MASTER TO MASTER_HOST = '', MASTER_PORT=3306, MASTER_USER='replication', MASTER_PASSWORD='slave'; i tried many time but in this query i am not able to use any variable why? if u know help me. thanks .

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• MySQL slave server from dumps

  - by HTF

  I've created a slave server from live machine which is acting as a master now. I use the following procedure to create it: mysqldump --opt -Q -B --master-data=2 --all-databases > dump.sql then I imported this dump on the new machine, applied the "CHANGE MASTER TO..." directive with a log file/position from the dump. Please note that I have around 8000 databases and I didn't stop the master while the dumps were running. The replication works fine but is this a properly method for creating a slave server? I'm planning to promote this slave to a master (different location) so I would like to make sure that there is a 100% data consistency between the servers. I've found this article where it says: The naive approach is just to use mysqldump to export a copy of the master and load it on the slave server. This works if you only have one database. With multiple database, you'll end up with inconsistent data. Mysqldump will dump data from each database on the server in a different transaction. That means that your export will have data from a different point in time for each database. Thank you

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• Java me : Can we retrieve bluetooth address of connected device from an open slave connection ?

  - by Rohit

  Here is a typical sequence of events that occur : Host device opens a service ( Host device accepts and opens all incoming connections) A remote device connects to host device. Now, we have a slave connection open at host device. At host device, I want to know the bluetooth address of remote device. I can always pass it as data from remote to host device, but can I extract it from connection object somehow without any data transfer? Thanks in advance...

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• Master/Slave DNS setup vs. rsync'ed DNS servers

  - by Jakobud

  We currently have primary and secondary DNS servers on our corporate network. They are setup in a master/slave type setup, where the slave gets its DNS information from the master. I'm trying to figure out what the real advantage is for the master/slave setup instead of just setting up an automated rsync between the two to keep the DNS settings matched. Can anyone shed some light on this? Or is it just a preferential thing? If that is the case, it seems like the rsync setup would be much easier to setup, maintain and understand.

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• Transfer DNS zones from master to slave (MS DNS to BIND9)

  - by Bryan

  Hello, I have a problem with DNS servers. My master dns server runs on Microsoft DNS server and now I want to start slave DNS server on Linux Bind9. The problems is that master MS DNS server can't validate slave DNS server (bind9) and can't resolve FQDN. Maybe, I missed something... firewall, dns configuration and network looks like ok. And the second question is: How I can make full transfer of dns zones to slave dns server? from MS DNS to BIND9 Thanks in advance. Regards, Bryan

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• Starting an Erlang slave node in escript fails when using custom Erlang in Ubuntu 10.4

  - by Adam Lindberg

  I have the following escript: #!/usr/bin/env escript %%! -name [email protected] main(_) -> NodeName = test, Host = '127.0.0.1', Args = "", {ok, _Node} = slave:start_link(Host, NodeName, Args), io:format("Node started successfully!"). When running it on Ubuntu 10.04 I get this: $ ./start_slave Node started successfully! $ I want to install my own Erlang (latest version, debug compiled files for dialyzer etc) since the stock install of Erlang on Ubuntu lacks some features. I put my Erlang binaries inside ~/Applications/bin. Starting Erlang normally works, and starting slave nodes inside an Erlang shell works as well. However, now my escript doesn't work. After about 60 seconds it returns an error: $ ./start_slave escript: exception error: no match of right hand side value {error,timeout} Even if I change the first line to the escript to use my erlang version, it still does not work: #!/home/user/Applications/bin/escript The slave node is started with a call to erlang:open_port/2 which seems to be using sh which in turn does not read my .bashrc file that sets my custom PATH environment variable. The timeout seems to occur when slave:start_link/3 waits for the slave node to respond, which it never does. How can I roll my own installation of Erlang and start slave nodes inside escripts on Ubuntu 10.4?

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• Surgical slave reads for Ruby on Rails, mulitple databases.

  - by Daniel

  Greetings, I'm currently working on a multiple database rails application. I want to off load the SELECT queries on to the slave databases for only SOME of the databases or specific models. The issue is that in places, we swap out the current database connection and put in a different one for a short time; to load fixtures or to handle sharding. Does anyone have any recommendations on a ruby gem that 1. will split select/(sql writes) with a considerable amount of control. We want to handle just some models and we are looking for a neat surgical fix. 2. does not monkey around with activerecord. 3. is still being maintained. TIA -daniel

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• Using audio plugins in a rewire slave application

  - by Nik Reiman

  I would like to be able to use VST/AudioUnit effects from a rewire slave such as Ableton Live, but it seems that Live doesn't let you use plugins when running in this mode. I'm not exactly sure why that is, but it would be nice to get working so that I could use VST plugins from within GarageBand without having to use the VST2AU wrapper plugin. What sequencers let you use VST plugins when running as a rewire slave?

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• Mysql replication, Slow resyncing of slave after an error

  - by James Hackett

  I have a slave that got an error about a months or so ago and got way behind the master. I fixed the error and now playing catchup with the master but its going very slowly. Its going at 1.3x real time. I was using less that 10% of the db resources when these writes were first happening so the speed of the server shouldn't be an issue. Is there any settings I can switch to help the slave catch up with the master?

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• slave dns server, resolv.conf configuration

  - by Tim the Enchanter

  I have two servers (a master and slave) running DNS (bind). What should the /etc/resolv.conf file look like for the master and the slave? For example should the servers running the DNS have only : nameserver 127.0.0.1 or should they refer to the I.P. addresses of each server, as the other servers on the network do : search <mydomain>.co.uk nameserver 192.168.1.52 nameserver 192.168.1.57

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• mysql master-master setup as a way to simply master-slave promotion

  - by Chris Go

  I'm trying to see if the following plan is viable. Goal here is to be able to do HA (uptime) and not necessarily for load -- writes are fine on one MySQL 5.5 server (with innodb) but not really possible when the database is down. Currently, I have a master-slave replication setup which works fine except it doesn't have automatic promotion (obviously). what I am planning on doing is setup master-master replication to possibly do this "automatic promotion" using Amazon Route 53 DNS Failover (Health checks). What I am trying to avoid is to NOT have to do the auto-increment trick because the "business folks" got used to the auto-incrementing PK as consecutive numbers (yeah, I know this is bad but data is from 2004). So, setup the master-master replication WITHOUT the auto-increment collision prevention bit. The primary master is db1.domain.com and secondary master is db2.domain.com In Amazon Route 53, setup DNS Failover record for db.domain.com - primary failover is db1.domain.com - with a TCP healthcheck on IP address port 3306 - secondary failover is db2.domain.com - with a TCP healthcheck on IP address port 3306 Most of the time (99%), unless tcp://db1.domain.com:3306 is dead, db1.domain.com will be served up on DNS hits to db.domain.com. In fact, hopefully this is 100%. The possible downsides of this is the loss of a primary key (collision) and I think I am OK with losing one order. We are a low data volume B2B business and can just call our client up if this occurs (like an order disappearing). Does this sound like a good plan? Then I will also run another slave replication on db1.domain.com as "master" to a slave-db1.domain.com -- not sure why, maybe for heavy SELECTs?

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• BIND DNS Master with Zerigo Slaves - BIND won't update the slave servers

  - by Anthony

  I've tried to resolve this myself and have looked through Google and Stack but haven't found the answer I'm looking for. Currently on a VPS server I have BIND DNS installed as a MASTER DNS Server. I use Zerigo's DNS service as SLAVE servers for public use: The Master doesn't receive queries - It's job is to simply create and modify DNS entries locally of which the SLAVE use to serve. Here is an excerpt of the BIND log, I set it to INFO event logging: 14-Apr-2012 23:00:00.234 general: info: received control channel command 'reload' 14-Apr-2012 23:00:00.234 general: info: loading configuration from 'C:\DNS\BIND\etc\named.conf' 14-Apr-2012 23:00:00.234 general: info: using default UDP/IPv4 port range: [1024, 65535] 14-Apr-2012 23:00:00.234 general: info: using default UDP/IPv6 port range: [1024, 65535] 14-Apr-2012 23:00:00.250 general: info: reloading configuration succeeded 14-Apr-2012 23:00:00.250 general: info: reloading zones succeeded 14-Apr-2012 23:16:22.750 xfer-out: info: client 174.36.24.251#47135: transfer of 'ajmakeup.com/IN': AXFR started 14-Apr-2012 23:16:22.750 xfer-out: info: client 174.36.24.251#47135: transfer of 'ajmakeup.com/IN': AXFR ended 14-Apr-2012 23:16:23.015 xfer-out: info: client 68.71.141.22#36212: transfer of 'ajmakeup.com/IN': AXFR started 14-Apr-2012 23:16:23.031 xfer-out: info: client 68.71.141.22#36212: transfer of 'ajmakeup.com/IN': AXFR ended As you can see there is no problem with Zerigo's DNS servers requesting new DNS data, when I force a reload that is; I don't believe, as per the way they are set as SLAVE, that they poll for changes. However the problem is the other way; the MASTER is not updating the SLAVE servers when reload is run (on the MASTER); it is a batch on a 15 minute timer. Below is my NAMED.CONF: key "rndc-key" { algorithm hmac-md5; secret "REMOVED FOR SECURITY"; }; acl "trusted" { 174.36.24.251/32; 68.71.141.22/32; localhost; }; options { version "not currently available"; directory "C:\DNS\BIND\etc"; allow-query { trusted; }; }; controls { inet 127.0.0.1 port 953 allow { 127.0.0.1; } keys { "rndc-key"; }; }; logging{ channel simple_log { file "C:\DNS\BIND\logging\bind.log" versions 3 size 5m; severity info; print-time yes; print-severity yes; print-category yes; }; category default{ simple_log; }; }; zone "ajmakeup.com" in { type master; file "c:\dns\BIND\zones\db.ajmakeup.com.txt"; allow-transfer { 174.36.24.251; 68.71.141.22; }; allow-update { none; }; }; Does my problem have something to do with 'allow-query' under options? You will notice that 'allow-transfer' is set explicitly on each DNS zone. In case you need it here is my RNDC.CONF: key "rndc-key" { algorithm hmac-md5; secret "REMOVED FOR SECURITY"; }; options { default-key "rndc-key"; default-server 127.0.0.1; default-port 953; }; server localhost { key "rndc-key"; }; Note: I am using WebsitePanel as my hosting panel and is such why it creates the zone enteries the way it does. Although I know I can change this behaviour, I do not wish to do so nor do I believe is the root of the problem. Thanks for your help.

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• PHP Check slave status without mysql_connect timeout issues

  - by Jonathon

  I have a web-app that has a master mysql db and four slave dbs. I want to handle all (or almost all) read-only (SELECT) queries from the slaves. Our load-balancer sends the user to one of the slave machines automatically, since they are also running Apache/PHP and serving webpages. I am using an include file to setup the connection to the databases, such as: //for master server (i.e. - UPDATE/INSERT/DELETE statements) $Host = "10.0.0.x"; $User = "xx"; $Password = "xx"; $Link = mysql_connect( $Host, $User, $Password ); if( !$Link ) ) { die( "Master database is currently unavailable. Please try again later." ); } //this connection can be used for READ-ONLY (i.e. - SELECT statements) on the localhost $Host_Local = "localhost"; $User_Local = "xx"; $Password_Local = "xx"; $Link_Local = mysql_connect( $Host_Local, $User_Local, $Password_Local ); //fail back to master if slave db is down if( !$Link_Local ) ) { $Link_Local = mysql_connect( $Host, $User, $Password ); } I then use $Link for all update queries and $Link_Local as the connection for SELECT statements. Everything works fine until the slave server database goes down. If the local db is down, the $Link_Local = mysql_connect() call takes at least 30 seconds before it gives up on trying to connect to the localhost and returns back to the script. This causes a huge backlog of page serves and basically shuts down the system (due to the extremely slow response time). Does anyone know of a better way to handle connections to slave servers via PHP? Or, is there some kind of timeout function that could be used to stop the mysql_connect call after 2-3 seconds? Thanks for the help. I searched the other mysql_connect threads, but didn't see any that addressed this issue.

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• Dell Inspiron N5110 Touchpad not detected

  - by Shahidh

  sanju@sanju-Inspiron-N5110:~$ xinput --list ? Virtual core pointer id=2 [master pointer (3)] ? ? Virtual core XTEST pointer id=4 [slave pointer (2)] ? ? PS/2 Generic Mouse id=12 [slave pointer (2)] ? Virtual core keyboard id=3 [master keyboard (2)] ? Virtual core XTEST keyboard id=5 [slave keyboard (3)] ? Power Button id=6 [slave keyboard (3)] ? Video Bus id=7 [slave keyboard (3)] ? Power Button id=8 [slave keyboard (3)] ? Sleep Button id=9 [slave keyboard (3)] ? Laptop_Integrated_Webcam_HD id=10 [slave keyboard (3)] ? AT Translated Set 2 keyboard id=11 [slave keyboard (3)] ? Dell WMI hotkeys id=13 [slave keyboard (3)] As above my touchpad is not detected by the system. version is Ubuntu 12.04 Can anyone help me?

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