72
votes
Accepted
Redis Cluster: (error) MOVED
The node did redirect you.
As the documentation explains, the client is expected to connect to the specified node to retry the request. The server does not do this.
If you're using redis-cli, then ...
- 244k
46
votes
Make a Docker application write to stdout
For a background process in a docker container, e.g. connecting with exec to /bin/bash I was able to use.
echo "test log1" >> /proc/1/fd/1
This sends the output to the stdout of pid 1,...
- 778
14
votes
Accepted
What is the minimum amount of servers for a production mongoDB cluster?
The minimum number is 1 server. If by "production" you mean "fault tolerant" then the minimum number is 3: you have a replica set containing 3 servers. The config servers also run on these servers. If ...
- 18k
10
votes
Accepted
Error when create a MicroK8s cluster : Connection failed. The hostname (xx) of the joining node does not resolve to the IP "xx". Refusing join (400)
I found the solution on github：https://github.com/canonical/microk8s/issues/2967#issuecomment-1059942384
Edit /etc/hosts on the 172.29.99.188 machine,Add:
172.29.99.188 cxsw
- 171
9
votes
Accepted
downgrade cluster functional level
After doing some research, it looks like you can't downgrade cluster functional levels, nor can you live migrate instances from 2016 to 2012 anyways. I would suggest using server 2016 instead of a ...
- 7,056
8
votes
Is Server Clustering Right for a 25 Person Business?
I've got two PE T110 II servers running my home virtualization lab, and while I might ordinarily suggest using different servers for an Enterprise implementation, I think in this scenario that the ...
- 110k
8
votes
HyperV Failover Cluster (with/without CSV)
Michael Brown already answered it, just wanted to add:
CSV is currently the best practice storage configuration for both Hyper-V, SQL FCI, and SoFS. 99% of the clustered systems I configure for the ...
- 5,445
7
votes
Make a Docker application write to stdout
for nginx you can have nginx.conf pointing to /dev/stderr and /dev/stdout like this
user nginx;
worker_processes 4;
error_log /dev/stderr;
http {
access_log /dev/stdout main;
...
and your ...
- 171
7
votes
Are ZFS clustered filesystems possible?
Why yes 😎, it is possible to build an active/passive ZFS-based cluster using shared DAS and multipath SAS.
Details at: https://github.com/ewwhite/zfs-ha/wiki
The key to this high-availability storage ...
- 197k
7
votes
Accepted
Redis cluster: 3 master nodes minimum?
Is it really true?
Yes, that's why it is in the documentation :)
In my mind this is correct if I would use sharding capabilities (data are shared between nodes), but what if I don't need it and I ...
- 894
7
votes
Redis cluster: 3 master nodes minimum?
Is it really true?
No. It's not really true. It's a strong recommendation (as you can tell from the "that works as expected" language; if you don't expect your data to be durable, and you expect it ...
7
votes
SQL Server Failover strategies
In SQL Server 2014 Standard Edition, your only built-in option for automatic failover without shared storage would be database mirroring.
If you upgraded versions to SQL Server 2016 Standard Edition,...
- 4,425
7
votes
Best options for storing and sharing data over mutiple servers, to be accessed by multiple users
DFS-N is OK (if applied properly, of course!), while DFS-R should be avoided like a plague. It has many issues and inability to replicate open files is a very serious one. It's funny MSFT had a "...
- 13.7k
7
votes
Best options for storing and sharing data over mutiple servers, to be accessed by multiple users
DFS replication is a nightmare. For 9 years old servers, I would go with Starwinds VSAN to do the replication between them. That was the reason why I have used it on one of the deployments. S2D ...
- 5,010
6
votes
Accepted
Replacing failed hardware in a hyper-converged cluster node
Think about the question here:
Hyperconverged solutions are focused on combining virtualization compute and storage resources together.
These are still built atop commodity servers (Supermicro, ...
- 197k
6
votes
How can I create shared disks for Windows SoFS VMs in VMware?
Even taking into account an upcoming "VHD Set" feature in Windows Server 2016, you would still need some shared storage to store VHDs. Try StarWind Virtual SAN or HP VSA, they both can present local ...
- 5,010
6
votes
Miserable performance of Hyper-V storage on CSV
If you use Broadcom NICs, try to disable VMQ on a virtual switches and on a physical network adapters: http://www.dell.com/support/article/ua/ru/uabsdt1/SLN132131/EN
You might also check if there are ...
- 8,981
6
votes
How does Virtual IP work for failing over a TCP connection to a backup server to accomplish high-availability?
We should clarify some terms and technology.
The image you show is that of a "Load Balancer." While technically, the Load Balancer will usually have one or more "frontend" IP addresses that connect ...
- 3,488
6
votes
Site-aware cluster migrates VMs to random nodes, not to the preffered site
You need to ...
(1) ... use something like Windows Server 2016 built-in Storage Replica (DR, so active-passive replication only).
https://docs.microsoft.com/en-us/windows-server/storage/storage-...
- 13.7k
6
votes
KVM+DRBD replicated between two active-passive servers with manual switching
Why not using things which have been checked by thousands of users and proved their reliability? You can just deploy free Hyper-V server with, for example, StarWind VSAN Free and get true HA without ...
- 8,981
5
votes
Is it a good idea to store Docker volumes in glusterfs?
The use of glusterfs would depend on the storage backend that you are using. As a cluster file system it is intended to cluster physical storage so it appears as one large continuous volume. This ...
- 2,751
5
votes
Apache load balancer for mod_proxy_wstunnel?
According Apache official documentation :
https://httpd.apache.org/docs/2.4/en/mod/mod_proxy_balancer.html
mod_proxy_balancer requires the service of mod_proxy and it provides load balancing for all ...
- 51
5
votes
Pacemaker and DRBD on Hyper-V
Is it possible to use Pacemaker in top of Hyper-V for now? Or may be exist another way to use DRBD in dual primary?
It's possible but resulting performance is not going to be great TBH. Get some ...
- 13.7k
5
votes
Hyper-v failover or replication in 2 node cluster
3rd party solution like StarWind virtual SAN. While this looks like it could work, they no longer offer the hyperconverged storage feature in the free version (ie can't be installed on a host running ...
- 13.7k
5
votes
HyperV Failover Cluster (with/without CSV)
CSV is layered on top of some physical shared storage so you can have [ cluster ] without shared storage.
https://en.wikipedia.org/wiki/Cluster_Shared_Volumes
You can still have a cluster without ...
- 13.7k
5
votes
Redis cluster: 3 master nodes minimum?
I know that this question is old, but if someone needs a similar setup can use Master-Slaves configuration instead Cluster.
You need:
2 Redis server at least
3 Redis Sentinel to monit the health and ...
5
votes
Accepted
How to specify two different subnets in NFS exportfs cluster resource on RHEL 7
I know its an older question but its in the top 10 on a google search so I thought I'd answer with what worked for me in case anyone else hits this looking for the same thing
I had a similar issue ...
5
votes
Accepted
Compatibility and difference between QSFP+ and QSFP 40Gb/s infiniband connections
QSFP+ stands for Quad (4-channel) Small Form-Factor Pluggable Plus, also known as QSFP10. Now QSFP/QSFP+/QSFP28 all use 4 channels to pass data.
QSFP - People mistake this for QSFP+ ALL the time. ...
- 143
5
votes
Which technology allows shared storage for clusters with preferred local reads and writes?
Since you about deliver shared storage system having local I/O preferably, I would suggest to look at solutions that do kind of asynchronous replication between clustered hosts.
I suspect the ...
- 3,918
5
votes
2 node cluster (active-passive) with Windows Server 2016
What are you looking for is the Workgroup WSFC (Windows Server Failover Cluster):
https://blogs.msdn.microsoft.com/clustering/2015/08/17/workgroup-and-multi-domain-clusters-in-windows-server-2016/
...
- 8,981
Only top scored, non community-wiki answers of a minimum length are eligible