Replication is the process of sharing information so as to ensure consistency between redundant resources, such as software or hardware components, to improve reliability, fault-tolerance, or accessibility.

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Branch office replicated file system

I'm looking for something that can replicate file systems between multiple branch locations. Our file servers currently run CentOS 7. I feel like there has to be a better solution that what we're ...
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+100

Postgresql streaming replication with restore_command for archived WAL files

I have a primary server that archives (and gzips) WAL files into /wal/archive/. At the moment, I'm attempting to set up a hot standby with streaming replication from a base backup. When starting up ...
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28 views

Connecting to a MariaDB server with master-master replication setup hangs randomly

I have a two server MariaDB master-master setup as documented on the DigitalOcean community page: https://www.digitalocean.com/community/tutorials/how-to-set-up-mysql-master-master-replication. The ...
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1answer
1k views

Large lag on mysql replication (Relay_Log_Pos and Exec_Master_Log_Pos does not increase)

Today my two slave's (one mysql 5.1 and second MariaDB 5.5, master is mysql 5.1) started lagging. Similar situation are quite often with lags rises to even 10000 seconds, because slaves have worse ...
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21 views

How to fix a messed up replication on MS SQL Server [migrated]

I restored a database from a backup. The database uses replication to publish to a different server. Assuming the database restore would break the replication, I tried to delete the replication and ...
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26 views

Gluster for replication/propagation

Say I have a bunch of servers that access a gluster mount to serve files via http. Files are sourced internally, and are copied from an internal server to the gluster mount on one of the download ...
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1answer
8k views

How do I fix issue causing “incomplete startup packet” log message trying to implement replication in Postgresql?

I've got two cloud servers running Ubuntu 13.04 and PostgreSQL 9.2. I've primarily used this blog post to aid me in setting things up. However, to do the initial database dump to the slave I'm using ...
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1answer
711 views

repmgr - after a failover switch, both nodes act as a master

I have a two node PostgreSQL cluster configured through repmgr. The database topology looks like this: db1 - 10.10.10.50 ( master ) db2 - 10.10.10.60 ( standby ) wit - 10.10.10.70 ( witness ) The ...
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2answers
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MS SQL Server 2 identical databases on different servers replication or mirroring to each other possible? [closed]

Hi: I have one free version of SQL Server 2012 express database running on Amazon AWS with 1 CPU and only 1 GB Ram . As you can see the CPU and RAM power are barely enough for my PHP scripts running ...
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1answer
1k views

Can't setup 3 nodes MongoDB recplica set

I just follow instructions in MongoDB document Replica Sets - Basics to setup a 3-node Replica set. Everything goes fine when I do the initiate and add first node in the primary. [foo@host-a ...
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2answers
202 views

Consideration for building shared storage for VMware environment DR site

I am investigating the of which one is the most preferable choice for DR environment ? between SAN based replication technology or 3rd party application (Veeam Backup and replication or VMware Site ...
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46 views

How to deal with VHD for database storage in a multi VM setup in Azure

I've learned that to have the most available Windows Azure VM setup it's best to create availability sets. My setup would be to have an availability-set for 2 web-VM's and a set for 2-sql-VM's The ...
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2answers
4k views

SQL 2008 R2 replication error: The process could not connect to Distributor

I have two servers running SQL 2008 R2 Standard, each with an instance named "MAIN". I have a small test database on my primary server (one table, 13 rows) that I want to replicate to a second server ...
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1answer
2k views

GlusterFS - Replication Over Odd Numbers Of Nodes

I tried to create a replicated volume across my 3-node cluster with the following command: sudo gluster volume create \ replicatedStorage \ replica 2 \ transport tcp \ gluster1.mydomain.com:/data \ ...
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1answer
1k views

Read Only Domain Controller not replicating after writable domain controller outage

I have a RO domain controller that replicates with a writable DC which is at another site. The other week the writable DC was out for about 2 days because of maintenance at that site. After this ...
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1answer
1k views

PostgreSQL master constantly demoted by pacemaker with repmgr

I'm in the process of setting up a PostgreSQL 9.2.8 cluster made of 2 nodes, one master, and one slave. I use streaming replication and repmgr 2.0. My platform is RHEL 6.3. Master and slave can be ...
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2answers
3k views

Ubuntu 12.04 glusterfs volume failed to mount at boot time

I have just setup 7 KVM guests, all running Ubuntu 12.04 LTS 64bit Minimal server to test out glusterfs 3.2.5 from the Ubuntu official repo. Two of them form a mirrored pair (i.e. replica 2), and five ...
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1answer
36 views

Safe to demote & rebuild AD replica running exchange?

We have two Windows 2008 r2 servers. One is located in house which runs all domain logins, resources, file sharing etc. The second server is a AD replica which is remotely hosted at our Datacenter ...
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15 views

MariaDB replication- slave with high loadavg

We recently set a master-slave replication with MariaDB 10.1.12 on RedHat 6.7 fully patched. Master and slave are powerful Dell R730 with 2 RAID arrays- 1) 2 x 15k SAS drives for OS in RAID1 2) 4 x ...
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1answer
18 views

Hyper-V Replication & Large Machine Observations

I have Oracle Unbreakable Linux 6.5 which runs Oracle ERP application & Database it has three VHDs 80 GB , 600 GB and 120 GB on daily basis it creates RMAN backup approx 32 GB which stores on 120 ...
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1answer
20 views

MS SQL replication run only with system account

I'm trying to configure a new replication with SQL Server 2012 I configured the distribution While configuring the publication, it asked for a user to run the snapshot agent. I set a strong user ...
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1answer
20 views

vSphere / SRM replication not respecting priority groups

I'm in the process of demoing VMware's SRM. The install is good and I can easily run a restore for a single machine. I'm developing a recovery script for a single application is spread across ...
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1answer
44 views

How do i measure redis replication delay?

Which of these can be considered to monitor replication delay ? Redis_master_repl_offset, Redis_master_last_io_seconds_ago , Redis_slave_repl_offset
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109 views

How to replicate files between two separate apache machines in bidirectional

How to replicate /var/www/html/ between two separate machines which has separate hard disk storage running Apache web servers. I was planning to setup load balancing between these two Apache servers ...
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1answer
62 views

WSREP: Bad value for 'socket.ssl_key'

I am attempting to initialize a new MariaDB Galera cluster with SSL-encrypted replication. I have followed this guide to the letter, specified different details for CA, Server, and Client ...
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54 views

MySQL replication - invalidating query cache entries (table)

We lately mved to MySQL V5.5 on CentOS release 6.7 with master and 2 slaves. Since then the replication process lags a lot behind the master with the line in the process list of: invalidating query ...
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33 views

Adding network-fault tolerance to drbd or drbd alternatives

I've been working with drbd for about a year now, and at this point I'm tearing my hair out in frustration. Every time there is a network fault (something that is disappointingly common in the ...
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1answer
42 views

Sync two Non-Enterprise SQL Servers [closed]

We have a SQL Server 2005 in one of our company's locations. Since DB calls from other locations are very slow, we would like to set up another SQL Server on the other location and keep the server ...
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42 views

PG, Redis, and Elasticsearch replication for 2 distant metal servers

After years of running a web app on ~15 separate VPS, I'm switching to a single physical server*. App uses 3 DBs: Postgres, Redis, and Elasticsearch, and can update to latest version on all 3. ...
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2answers
760 views

postgreSQL replication and failover with repmgr on Ubuntu

I'm new to Linux and have been tasked with setting up a redundant Linux DB server with PostgreSQL. preferably the fail-over needs to be automatic, but a manual process will be fine for now. What I ...
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38 views

Unable to connect to MASTER: Resource temporarily unavailable : Connecting to MASTER no:0

I'm currently working on simle active stand/by Redis clustering for query caching with Keepalived. The problem I'm facing is when I shutdown&start(restart) the host1 server for testing, it ...
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36 views

Replication issue on all 3 domain controllers

We have 3 domain controllers in server 2012. Replication is failing miserably. Repadmin /replsummary dc1 rpc server not available dc 2 rpc server not available dc 3 "Insufficient attributes were ...
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1answer
476 views

AD Replica DC Promotion Stall

I recently inherited infrastructure duties for a small startup I am working with. My traditional role has been development, so bear with me... I was hoping to start off on the right foot, and get ...
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63 views

Unable to create index on solr, when using Zookeeper

Evening, I've created a what I believe to be a simple SOLR cluster, with Zookeeper (external binaries instead of the embeded). For simplicity, this cluster is: Master: SOLR1 Slave: SOLR2 Both ...
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90 views

MongoDB automatic failover between 2 data centers

If I deploy a MongoDb replica set across only 2 data centers, if one entire data center fails, can there be automatic failover to the other data center? Consider the situation where 1 data center has ...
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1answer
319 views

Deleted Domain System Volume. How do I recreate it; I have no backups

As the title suggest I am basically screwed. Before all this happen; I had one problem: My group policies were not replicating from PDC to other DCs. I have three Dc's in production. As you can ...
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3answers
21k views

How to replicate all public folders in Exchange 2010?

I have a mailbox server with a mailbox database and a public folder database. I add a second mailbox server and create a mailbox database and a public folder database on it. For mailbox databases, ...
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34 views

Moving mysql slave

I am trying to move MySQL slave from old pc to new. Original slave is MySQL version 5.6.12 same as new slave(MySQL is part of wamp 2.4). Replication works fine at old machine. But when I stop slave, ...
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22 views

mysql master to master replication with one slave

I have 3 servers Server A master to Server B Server B master to Server A and Server C Server C slave to Server B When I add table to Server A, it replicated on server B but not in Server C When I ...
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6k views

How to find slave's IP address and user name from Master server?

I am writing a code to extract the ip address and username of slave server in a MySQL replication environment. Does anyone know any function, variable, or something that I can run on the console and ...
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1answer
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// , Can I change the MASTERAUTH value on a running Redis instance in a Redis Cluster?

// , According to http://redis.io/topics/security, I can set a requirepass value, for example, requirepass foobared, in the Redis configuration files. However, I don't want this in my configuration ...
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2answers
97 views

Active Directory replication target principal name incorrect

I have a small 2 DC domain using Win 2008 R2 machines. Recently, one had to be restored using backup exec system recovery. Now the two are failing replication. I have ran DCDIAG on both (see below) ...
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1answer
299 views

Kubernetes Update Pods in Replication Controller behind Service

We have a deployed API in Kubernetes. The API is deployed via replication controller to pods and a managing rc. I would like to update the configuration to the API pods using rolling-update. I can do ...
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3answers
641 views

<suffix> invalid DN 21 (Invalid syntax) on Converting slapd.conf OpenLdap

Actually i want to configure ldap as master-slave replication using syncrepl method, On any reference which i found,I'm running on Centos 6 machine and openldap v2.4.23. I following step by step on ...
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1answer
328 views

Can not start PostgreSQL replication resource with Corosync/Pacemaker

I'm setting up a PostgreSQL replication on two servers (CentOS 6.5) with HA by Corosync/Pacemaker. My software info: postgresql91-9.1.19-1PGDG.rhel6.x86_64 ...
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Merge and transactional SQL replication…database empty (SQL 2005)

Firstly, let me just say that I'm a novice at SQL in general and this might be an easy fix for someone reading, but I've been unable to find anything that would explain or help my issue online. If ...
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1answer
3k views

SQL Server replication pending transactions

I'm having a problem with a transactional replication. I have the publisher in my server and there is a subscriber in another server. In my server, if I go to the details of the subscription I can ...
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1answer
123 views

elasticsearch not creating replica shards

I am banging my head for the past two days on this one. I have setup an elasticsearch cluster of two nodes. The configuration of each node is pretty simple: node.name: "server1" ...
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1answer
49 views

both test lab Domain controllers need initial synchronisation

Im trying to setup a test lab for our 2008R2 AD environment but am having trouble getting the domain controllers to start. If I just start the PDC with all FSMO roles (DC01) it gives an error saying ...
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1answer
2k views

Missing SRV record at DNS server

Server 2008R2. 2003 functional level. One of my branch DCs, which we will call BranchDC1, is not registering SRV records in example.com/_msdcs/gc/_sites/_tcp. The DC is marked as a Global Catalog in ...