Questions tagged [replication]
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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PAM deems Kerberos password as expired
I run Kerberos / LDAP authentication in a small network for years. Kerberos is held in LDAP, which in turn is replicated to another site. Machines at the second site authenticate to the replica, the ...
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321
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MariaDB Master-Master replication with 3 servers, no ports open on master
I want three MariaDB database servers, one master and two "slaves". I want to be able to read and write on every server, and have this replicated on the other servers. I read on the internet ...
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MariaDB replication lagging up to a dozen times a day for no obvious reasons
We first set up MariaDB replication using less powerful servers but considering our increased database load we had to rent more powerful servers and that's when the troubles began.
Right now the ...
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35
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mongo secondary node - weird log entries
I have mogodb cluster with 4 nodes, all nodes work on standard 27017 port. I found weird things in my mongod.log on a secondary node:
{"t":{"$date":"2022-03-26T23:22:34.593+03:...
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533
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MySQL 8 replication via non-ssl connecion
I'm trying to setup tiny master-slave environment with percona-server-server.x86_64-8.0.27-18.1.el8.
A plan is to use non-ssl connections between the nodes as the servers will communicate in the LAN ...
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181
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Replicating filesystem Samba and Windows
I'm looking for a way to create a replicating filesystem between Samba and Windows. I thought that DFSR would be the answer but Samba doesn't support SYSVOL replication. I also looked at syncthing ...
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691
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Stretch Cluster File Server with Storage Replica - Partnership not reversing on failure simulation
First off, sorry if this is the wrong place to post this.
I have a Storage Replica setup running in a MSCS Stretch Cluster configuration, two sets of two VMs with each set running on a separate ESXi ...
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MySQL not saving to separate data directories
Lately I've been struggling with MySQL and it's data directory a lot.
At first, I've tried docker for multiple instances but our company doesn't prefer docker no one knows why.
So I come up with a ...
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How to debug Hyper-V replication issues
We are hosting some VMs that are virtualized with Hyper-V. For these we have set up replication which works fine in the beginning but starts to fail pretty soon.
The error it shows when looking at the ...
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Master DB latency with AWS RDS cross region replication
I have my app setup in 3 regions (EU, AP, US) and the master MySQL RDS resides in eu-west-1, with read replicas in the other regions.
This works great for read queries, with the region specific app ...
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372
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hyperv replica multiple sites
I wanted to know if that is possible with a hyper-v replica before I start with the implementation.
I have 3 sites hosting 3 stand-alone hyper-v servers (acting as primary) and I wanted to set up a ...
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2nd lvl slave can't conect to 1st lvl slave mysql replication
Simple exercise but not working. Help me plase.
Context:
Lptp1, Lptp2 -> Ubuntu20.4 both
Lptp1 dbmaster, Lptp2 dbslavetwo, Lptp1 dvsubslave -> all Ver 8.0.24 for Linux on x86_64 (MySQL Community ...
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How does one go about using master to master replication along with something like rsync to keep two identical copies of an application identical?
I have servers that do things for me at home, for instance they keep copies of my bookmarks in the way that del.icio.us used to (nextCloud) and keep copies of my code (gitea).
Initially I thought that ...
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Mixing Galera and MariaDB/MySQL replication
reading about it online, it appears we can use both Galera replication and native MariaDB/MySQL replication together. Can anyone confirm that this is correct?
I'm thinking of a scenario where Data ...
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OpenLDAP syncrepl does not recover after network interruption
We have an issue we have discovered where syncrepl does not recover after a network interruption.
Environment:
Centos 7 replicas
OpenLDAP 2.4.44(-21.el7_6)
Loglevel set to comm sync (produces nothing ...
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Hyper-V Replication without Domain
I have a hyper-V host in a different DC that I want TWO source servers to replicate to.
I have followed guides such as https://michaelfirsov.wordpress.com/hyper-v-replica-in-windows-server-2016-...
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BIND9 replication puts wrong content into some slave zone files
Trying to implement primary/secondary (master/slave) replication on Bind 9.11.4, Amazon Linux 2. Also fails with Bind 9.8. Have 4 views. For zones that cross multiple views and use different zone ...
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"ldap_modify: Server is unwilling to perform (53) additional info: shadow context; no update referral" ERROR in my ldap server
Iam trying to do multi master replication on my LDAP server on RHEL 7 but I am getting below error while running command:
#ldapmodify -Y EXTERNAL -H ldapi:/// -f ldap01.ldif
"ldap_modify: Server is ...
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267
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SQL Server 2014 not replicating NEW non-clustered indexes
I have an instance of SQL Server 2014 running replication. I have selected the option to copy nonclustered indexes on all tables:
When this was first enabled, all existing nonclustered indexes were ...
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686
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How to migrate a mysql master/master replication system to a new system
I am using a system with two machines running mysql in master/master replication.
I would like to move the systems to new machines who are also doing master/master replication. Is it possible to do ...
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288
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AD replication stops
i have a domain controller located in a distance site which has a replication problem. Replication stops after a small period of time (about half an hour). The only way to resolve it is to change the ...
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469
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Replication from Clients to Hyperv cluster offsite
I want to replicate virtual machines that are at client sites to our cluster.
Our cluster is 3 hyper-v's clustered together with san as storage. The cluster is in the domain. The replica broker is ...
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AD replication: The target principal name is incorrect. 2146893022
I have three domain controlers, and repadmin /showrepl command outputs the following:
C:\Windows\system32>repadmin /showrepl
Repadmin: running command /showrepl against full DC localhost
Default-...
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402
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Synchronize Oracle database on VM under KVM using DRBD
We have two physical servers and we want to use KVM to create some VMs.
One of the VMs will contain an Oracle 12 database and we want to make it highly available.
We thought of using DRBD to ...
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290
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Why does the replicated disk become larger than original
We have two physical (one is 2012 R2, the other is running Server 2016) servers with VMs that replicate to the other computer. On Sundays we backup the replicated disks (after creating a shadow copy) ...
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370
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LDAP replication?
to improve resilience, we have replicated an OpenLDAP server. There are only reading rights on the client.
After some attempts, there are no more error messages. The data part is apparently ...
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164
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Why is my Syno NAS creating a snapshot each hour instead of one per day?
[Background information]
I am running a Synology DS916+ consisting of 4 disks forming 2 storage pools. Storage pool 1 is made up of 3 disks holding all my data on a SHR (Syno Hybrid RAID). Storage ...
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1k
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Hyper-v 2016 VM replication between domain and workgroup - no longer working
I have three hyper-v servers on an AD domain, which replicate between themselves nicely. I have two other hyper-v servers which are separate, in their own workgroup, they are being built in my ...
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2k
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Sync of SYSVOL content between Windows 2016 Domain Controllers
I have the following setup:
Two Domain Controllers in different sites (both Windows Server 2016)
-The sites are permanently connected via a VPN (so the servers can directly reach each other)
The ...
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aws config with one domain but two instances to read from possible?
This just came into my mind and I wonder if the below is possible?
I have a domain www.example.com
but the client is all across Canada, would it be a good idea to have a server(including db) in both ...
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1k
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Retry MySQL replication error instead of skip
I have replication error like
Last_Error: Error 'Unknown column .. on my slave, because for some reasons the schema are not the same (we are using statement bases replication).
Now, I've fixed the ...
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390
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mysql simple master-slave replication stops without any errors
mysql Ver 14.14 Distrib 5.7.21-20 (it's Percona fork, if it's matter).
Trying to make simple M-S replication, only 2 servers, different id-s.
Replications starts normally, but after a while (several ...
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159
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Hyper-V Replication Size
We have 2 VM's running Windows 2012 (not R2) in a Windows 2012 R2 Hyper-V Environment. The servers are both on the same host and are both replicated to the same server at a remote site. Both servers ...
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348
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Powershell script file not appearing in domain sysvol on all machines
I've run into a strange problem that I suspect may be related to DC replication.
We have two DCs, let's called them domaincontroller1 and domaincontroller2 for the purpose of this question.
We've ...
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133
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Scheduled tasks when replicating servers
Currently we have a single server that is serving customers and we've planned to add a new server and setup load balancing and database active cluster, so in this case both servers would act the same.
...
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301
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Windows Azure VM Replication Health Critical
In the Windows Azure Portal, the Replication for some of our VMs are showing that the replication health for them is critical. However, the status of them is protected and the they are crash-...
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Continually monitor on-prem databases for changes and update AWS databases
We have several servers hosted on-prem that are older systems.
I want to use Data Migration Service(or any other AWS tool) to monitor the older SQL Server 2008 instance (just a few tables, not the ...
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219
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mongodb is reachable through each server but replica sets cannot find each other after iptables
I have 9 machines where I set up mongod replset instances. I set iptables so servers can see each other and i can confirm this sshing into one server and connecting to a mongod in another server. But ...
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579
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Centos 7 , Master-slave replication iptables?
This is the iptables on my mysql_slave server:
# sample configuration for iptables service
# you can edit this manually or use system-config-firewall
# please do not ask us to add additional ports/...
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1k
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Second Domain in Forest - One Way Replication
I added a new domain tree to an existing AD forest which previously contained one domain. Let's call the new domain xyz.com and the existing forest root domain abc.com (the forest is abc.com).
...
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2k
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Windows Server 2012 DHCP Failover and MAC address replication
I'm stuck with a problem in my configuration.
We have a domain controller who works also as DNS and DHCP server. Yesterday i deployed a secondary DHCP server and configured it in a failover cluster ...
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2k
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Automatic Active Directory Replication not working: dc1=samba=CentOS + samba4 + dc2=dc=WinSrv2008R2SP1
Main domain controller is made with samba 4.3.4 on CentOS 7 (name=samba). Just made a new second domain controller on WinSrv2008R2Sp1 (name=dc).
Sysvol replication was made using the following ...
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156
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Azure Site Recovery - Disk Size Unusable message after shrinking disks
I have a customer with a Hyper-V VM (running under a Windows 2012 R2 Hyper-V Cluster) that had drives larger than 1023GB. When I went to replicate the VM to Azure using Azure Site Recovery I got an ...
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138
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Configuring external master GCP errors
I'm following the GCP tutorial to configure an external master.
The external master is a mysql 5.6 db hosted on a Google Compute Engine running ubuntu 14.04.
The API is enable, the dump has been ...
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170
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Heimdal kerberos ipropd-master failing on start-up with "open (null): Bad address" error
I am trying to set up a Heimdal KDC environment with one master and one replica. When I try to start the replication service on the master, it fails with this error:
ipropd-master[22640]: open (null):...
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586
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MongoDB : sharded cluster, add a shard that contains all data
Last year, I set up a set up a mongoDB production cluster.
It has a router, 3 config server, and 3 shards (wuth a big database and data spread between them). We wanted to add other shards to form ...
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What is best method for fixing a out of sync mysql slave when pt-online-schema-change, pt-table-sync, xtrabackup do not work?
We all know, there are several methods for syncing data from a mysql master to a slave. After reading many blogs about this issue, two common tools always come up:
pt-online-schema-change
pt-table-...
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42
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Riak CS - Number of replicas
From the official Riak documentation: "In a Riak CS system, any node can respond to client requests - there is no master node and each node has the same responsibilities. Since data is replicated (...
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490
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Adding 2012 R2 Server to existing Essentials 2012 R2 Domain
I've been running a Server Essentials 2012 R2 single server for 2 years, it's been reliable so far. Our business is beginning to outgrow, and I have recently added a second production server running ...
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69
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how a client switches from provider to consmure openldap centos 7
I have setup a basic provider/consumer and client openldap on centos 7. Data does get replicated to the consumer when I add something to the provider and it is all synced up. The client can read info ...