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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SSHFS mount remote directory which subfolder are mounted locally

I have two servers FTPa and FTPb Each server is running PHP web file transfer app that sits in /var/www/html/files/ On both servers some of the app subfolders are mounted with folders inside /sftp/ ...
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1answer
20 views

A DegradedArray event had been detected [on hold]

at morning cPanel send me this email This is an automatically generated mail message from mdadm running on A DegradedArray event had been detected on md device /dev/md/1. Faithfully yours, ...
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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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1answer
9k 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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14 views

GlusterFS over Internet using asymmetrical connections

I am setting up a storage-network with multiple locations and planned using GlusterFS. At the moment I have some questions: Geographical location: 3 offices each office has an asymmetrical ...
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7 views

Setup master master for postgres with one is Amazon RDS and another one external?

Is it possible to setup master master for postgres with one is Amazon RDS and another one external? My circumstance is I'm currently using postgres on Amazon RDS but I want to add another server in ...
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4answers
5k views

Create a MySQL slave from another slave, but point it at the master

Problem I have MySQL replication setup between 2 servers, master (A) and slave (B). I need to add a new slave to the mix (C). I want this slave to get it's updates directly from the master, I do not ...
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5answers
7k views

Is DRBD the only viable block replication solution for Linux?

I've found myself needing redundant storage at a block level. File-level replication (Gluster, GFS, etc) does not work for my use case. It looks like DRBD is the go-to solution for block replication....
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28 views

Replication of MYSQL to MongoDB

I have one doubt. Is it possible to suggest some steps? I have my database in MongoDB at digital ocean. Planning to incorporate Opencart solution. OpenCart solution doesn't support NOSQL. Option ...
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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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1answer
51 views

Postgresql replication with pgpool or pgbouncer

I'm looking for a good configuration for a postgresql replication with a robust failover strategy (self hosted). Actually, I configured two postgresql instances in master / slave with repmgr. Now, I ...
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8 views

litespeed webserver files and database replication

we are going to switch our webservers into litespeed...So now we have tried in trial version. Now, we have configured litespeed load balancer and two litespeed webservers with database replication ...
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8 views

Incoming mails not directly synced

I set up 2 mailservers with Postfix and Dovecot, one main-server and a backup-server. They are synced with dsync which is working good, but not as expected. If I receive a mail, I can see it on the ...
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0answers
11 views

Sync data between AD DS and AD LDS with differing schema

first off I have only recently been introduced to this world so forgive me if I trip up a bit :) From what I have read about replicating/synchronizing between AD and LDS it tends to disagree when 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
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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1answer
33 views

DC Replication over VPN Server 2012R2

I Have two sites right next to one another connected using Draytek routers an IPSEC secure vpn tunnel. One site had all the servers the other none. I installed a new DC on the main site them moved ...
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0answers
29 views

Server 2012 replication error

I have 2 Windows 2012 DCs (DC1 and DC2). From DC2 replication works while from DC1 I keep getting the error "replication error rpc server is unavailable. I'm attempting to do this from Active ...
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1answer
2k 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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42 views

How to remove a lingering object in a child domain that is from a totally DIFFERENT child domain

Replication is broken in one our child domains and it seems to be caused by a lingering object that is from an entirely different child domain Source domain controller: 031df1e9-aa10-4ccb-b5fb-...
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0answers
89 views

Best way to streamline DNS replication in a Parent-Child forest with poor network speeds?

I've recently started at a new place and I'm wondering the best approach for DNS resolution/replication It's a single forest (root.local) with 5 child domains (let's call them child1, child2 etc). ...
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12 views

How to restore mySQL slave server that is lagging behind in transactions

I recently setup replication between two servers for the purpose of facilitating a fail-over scenario between the master and the slave. I'm using the mySQL utilities fail-over utility and it was ...
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1answer
21 views

Setup MySQL replication of specific tables of a database to another mysql server

I have several production MySQL databases running on an RHCS cluster. I want to setup replication of one specific database, with only specific tables from that database, to another brand new mysql ...
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1answer
545 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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31 views

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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64 views

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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74 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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30 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
963 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
76 views

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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2answers
203 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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1answer
64 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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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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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
44 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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17 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
26 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 ...
2
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1answer
25 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
79 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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2answers
131 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
82 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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95 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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35 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
44 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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0answers
56 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
793 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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0answers
52 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 ...
0
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1answer
38 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 ...
8
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1answer
523 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 ...