79 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 ...
Michael Hampton's user avatar
49 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,...
Pieter's user avatar
  • 818
11 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
ya chen's user avatar
  • 181
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 ...
Spooler's user avatar
  • 7,126
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 ...
Stuka's user avatar
  • 5,775
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 ...
ewwhite's user avatar
  • 198k
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 ...
Muayyad Alsadi's user avatar
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 ...
Itamar Haber's user avatar
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 ...
Dominic Scheirlinck's user avatar
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,...
Brent Ozar's user avatar
  • 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 "...
BaronSamedi1958's user avatar
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 ...
Strepsils's user avatar
  • 5,115
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, ...
ewwhite's user avatar
  • 198k
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 ...
Strepsils's user avatar
  • 5,115
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 ...
batistuta09's user avatar
  • 9,106
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 ...
Appleoddity's user avatar
  • 3,860
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-...
BaronSamedi1958's user avatar
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 ...
batistuta09's user avatar
  • 9,106
6 votes
Accepted

Failover Cluster Disk Replication

Storage replica supports either Cluster-To-Cluster replication or Stretch Cluster with shared storage. Technically you should be able to configure it, if you have separate shared storage connected to ...
Stuka's user avatar
  • 5,775
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 ...
user380440's user avatar
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 ...
BaronSamedi1958's user avatar
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 ...
BaronSamedi1958's user avatar
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 ...
BaronSamedi1958's user avatar
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 ...
Daniel Carrasco's user avatar
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 ...
Jacqueline Loriault's user avatar
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. ...
KrisGT's user avatar
  • 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 ...
Mr. Raspberry's user avatar
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/ ...
batistuta09's user avatar
  • 9,106
5 votes
Accepted

vSphere 6.5 HA agent cannot be correctly installed or configured

I know you mention you already tried it, but in case it helps someone else I just wanted to say that the solution for us was to disable / remove the HA configuration entirely from the entire cluster ...
Paul Hite's user avatar
5 votes
Accepted

VMware - cluster resources utilization

Thanks for the clarification, the function you need to enable and configure to do this is called 'admission control' within the HA service. Basically it'll stop you adding in more VM resources than ...
Chopper3's user avatar
  • 102k

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