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.
1,044
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Recommandation / best practise for site to site replication as cold standby with ESXi Cluster
I have two ESXI clusters at location A, each consisting of 2 ESXi servers. 1 cluster is in the DMZ and one cluster is in the LAN. Various virtual machines are running on them. In total, there are only ...
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2
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ZFS: Handling massive no. of concurrent RW operations and failover
I have a single ZFS/Linux instance with a file that can grow to those crazy sizes supported by ZFS.
A large number of concurrent users need to read/write from/to this file over the public inter net. ...
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112
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MariaDB Replication on selected columns
I would like to ask a question that I am sure someone who is a lot smart then me can answer.
I have a main MariaDB that holds all my tables and columns etc (total of 64 tables) and this is stored on ...
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How to stop/break replication between 2 domain controllers that are in same domain? [closed]
So I was attempting to break replication between 2 domain controllers by editing objects in AD, since I cant just go to powershell and stop it with command, but it was unsuccessfully. I have to stop ...
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Can I Ldap Sync replication to a different backend?
My current OpenLDAP backend is BDB can I replicate (syncrepl) this to another server using a MDB backend?
Probably a no but thought I'd ask.
Thanks,
Andy
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Get list of VMs NOT enabled for Replication using Powershell?
I want to monitor the Replication status of all VMs on our Hyper-V.
All our VMs are replicated. When a replication fails OR the VM is removed from replication, I want to know. I found the following ...
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1
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how number of replicas is aligned with crush rule in a ceph cluster
I have some difficulties to understand whether the crush rule is aligned with the number of replicas. So, imagine I create a crush rule named replicate_in_2_racks as follows:
ceph osd crush rule ...
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283
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1 Domain Controller(s) with replication in progress
I have 3 DCs (DC01, DC02 and DC03).
If I create a group policy on any DC I find it replicated to the others.
But I see an error in Group policy management, in domain status if I click “Detect Now” it ...
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270
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Failover Cluster Disk Replication
We have a Windows failover cluster containing a shared disk assigned to a Role and want to set up replication from it.
We tried removing the disk from the cluster to use DFS Replication, however we ...
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Storage Replica Configuration Failure (error code 0x8009030e)
I`m not able to establish a storage replica between 2 windows servers 2016.
#The script I used
$SR = @{
SourceComputerName = 'Server-1'
SourceRGName = 'RG-1'
SourceVolumeName = "A:"
...
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Using MySQL/MariaDB replication, how to know when the Replica is in a consistent state?
This is a question about MariaDB (mostly) and a replication that I am considering.
For this replication, the Primary database is updated every minute by a process which can take about 15 seconds to ...
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How to Set Intra-site Replication Delay Time (Active Directory)
Cannot configure replication delay. I have 2 domain controllers (DC1 and DC2, Windows Server 2019), both in the same site. I set the replication delay time in the Server Manager snap-in "AD Sites ...
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1
answer
581
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Is it possible to have MySQL/MariaDB bidirectional replication?
I am trying to install replication on several MariaDB servers.
With no experience at all on this.
I am wondering something.
Would it be possible to have both servers acting simultaneously as master ...
3
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1
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Howto: Block or File replication across 3+ nodes without a SAN
The setup
I admin the backend for a website that currently exists on a single node using Nginx (webserver), Neo4J (database) and Wildfly (app server). The website is getting enough traffic that we ...
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316
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How to know if an S3 bucket with Cross-Region Replication is fully replicated?
I want to setup my S3 bucket to replicate in another region. Once it's fully replicated, I will make that bucket the main one (the idea is to migrate all data from one region to another). I know how ...
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How to know if an AWS RDS instance is fully replicated?
I setup a replica in a different region for my RDS instance. It seems to be working except that the status is always "Replicating". How can I know that the instances are fully in sync? ...
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How to fix MARS (Multiversion Asynchronous Replicated Storage) timeout when viewing status?
I'm running MARS (Multiversion Asynchronous Replicated Storage) between 2 remote locations, and for the most part it is running acceptably for my needs.
As part of monitoring I periodically issue a ...
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How Object-GUID replicated
since Object-GUID is a non replicated attribute, then how All DCs have same object-GUID for an object?
how object-GUID is replicated to all DC
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How to add a new database on replication?
I have a mysql replication with two servers.
There are actually 3 databases on it.
On master :
server-id = 1
log_bin = /var/log/mysql/mysql-bin.log
expire_logs_days ...
3
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2
answers
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How should I automate replication of a production MySQL db onto a read/write dev server for testing while also scrubbing the data first?
I know there are lots of variables here, and they're highly dependent upon the applications in the environment as well as the needs of the org. I read this post first, as the question was similar.
[...
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Active Directory Replication Issue
I have 2 DCs in my lab environment. So I just wanted to check the replication status using repadmin /replsummary but it throwed me an error : 1722 The RPC server is unavailable. I forced replication ...
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Monitoring of MySQL replication and alerting when replication is not working
I have a question about monitoring of MySQL replication and in particular about alerting using Grafana/Prometheus.
We have 2 MySQL(MariaDB to be exact) instances for which replication is configured: ...
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In terms of replication, can an OpenLDAP consumer act as a provider to another OpenLDAP server?
If I have an OpenLDAP server configured as a replication provider and a second OpenLDAP server configured as a consumer, can I configure the second server to act as a provider for a third OpenLDAP ...
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Why it asks me to input password here to restart db
I just have done
pg_basebackup -h primary_host -p primary_port -D PGDATA -U replication user
and I jsut wanted to restart the db, so I did
sudo su - postgres
sudo service postgres restart
and the ...
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1
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400
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Snaphot sizes in ZFS and syncoid backups of them
I got a question about ZFS snapshotting:
So, as far as I understand, when I take a snaphot of a ZFS dataset, the snapshot will be initially 0 bytes in size, because at the moment of creation, there is ...
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1
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294
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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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1
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316
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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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3
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openLDAP certificates untrusted or revoked
I've already spent two days on this problem but I can't find any solution.
Two openLDAP server run from docker on different hosts in master/master scenario. ldapsearch command or syncrepl process run ...
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213
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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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411
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kubernetes - Running dovecot with serveral replicas
I am in the process of setting up an email server through kubernetes. I managed to get postfix up and running and now am trying to setup dovecot. As I am expecting a bit of traffic for dovecot I want ...
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493
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Hyper V Dedicated Network Traffic for Hyper V Replication between two Hyper V Server
our scenario
The scenario is applied exactly with our planning setting, we need to configure Replica on our VM inside Hyper-V, the issue is how to configure or dedicate a specific network for a ...
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Postgresql - Master\Slave Async Replication - How to quickly fail back and forth?
I have two hosts set up as very simple master\slave. All servers connect to the floating IP 10.1.1.10.
Host A:
Designation: Master
Floating IP - 10.1.1.10
Standard IP - 10.1.1.11
relevant pg_hba....
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1
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712
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How do you handle IP addressing at a DR Site
I've found various tools that handle replicating virtual machines from one physical location to another for disaster recovery purposes. The part that I am struggling to understand is how these tools ...
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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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528
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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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178
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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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681
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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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2
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216
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MySQL replcating huge changing data
Hi I have a master MySQL server with 950 gb of data and slave has stopped for some reason and there is a difference of 80gb of data.
so I started to setup new slave .
Since the data is changing and ...
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1
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How to send a single parent ZFS filesystem snapshot and all its descendents' same snapshot to a new pool?
If we zfs snapshot -r tank@20220129, all sub-filesystems also get that snapshot.
How to send that single snapshot of tank with all sub-fs's to a new pool (no historical base of snapshots)?
While zfs ...
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1
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924
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openldap master/slave replication configuration return TLS error from slave
I am trying to add a TLS secured replication between a master and a slave ldap server. The replication without TLS work well.
I encounter this error from the slave : slapd_client_connect: URI=ldap://...
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1
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518
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Two PDCs, two ADs, two domains - how to replicate one domain/AD to the other?
Here's the history:
SERVER2 was a 2016 Essentials Edition server, standalone with no other DCs. The OS became corrupted in a few areas, and so a decision was made to replace it. A standalone clean ...
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Allowing untrusted clients read-only replication of public data in a redis instance?
I've got a database of publicly auditable votes, updated in real time in a redis instance. Nothing else is in that redis instance. It has been separated from related data in a second redis instance. ...
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Should replica DB be in 'recovery' - PostgreSQL
I have two databases that are using streaming replication and appear to be in this state
postgres 16319 0.0 0.5 137949952 3077260 ? Ss Aug22 0:11 /usr/pgsql-12/bin/postmaster -D /var/lib/pgsql/...
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How to replicate growing files?
I need to replicate a bunch of continuously growing large log files from a network file share.
Can't use rsync, because I don't have ssh access to the server.
Is there any existing Linux tool that can ...
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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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1k
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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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1
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997
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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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2
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491
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AWS EC2 MySQL Replication: Config To Query Slave From Master
I have successfully set up a MySQL master-slave situation on separate AWS EC2 instances.
The slave is running and is successfully replicating the master.
So far so good.
Now I want to be able to query ...
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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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1k
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OpenLDAP replication error
I have 2 OpenLDAP servers with replication activated and everything used to work fine.
A few days ago, the "replica" account's password expired. And since then I was unable to make ...