Questions tagged [high-availability]

High availability is an architectural consideration often involving degrees of redundancy to insure availability in case of system or component failure.

Filter by
Sorted by
Tagged with
0
votes
1answer
11 views

What happens to existing tcp sessions when a certificate is changed and haproxy is reloaded?

There may be two major reasons for changing a certificate. 1. Ordinary rotation, for example, due to expiration. In this case I would like to have a 100% high availiability. Existing sessions would ...
0
votes
0answers
18 views

fence_gce is not working as expected on GCP?

I have configured vanilla cluster with fence_gce. stonith_rhnfs01 is on node1 and stonith_rhnfs02 is on node2. Now I bring down node2. The stonith_rhnfs01 was already on node1 & stonith_rhnfs02 ...
0
votes
0answers
15 views

My GitHub Pages website went viral. 120k page views in 24h. Where do I go from here?

So I built nesteggly.com. Literally an MVP I cooked up over the past couple of months to help my girlfriend plan her retirement. Being a 100% static website and not thinking many people would find it ...
0
votes
0answers
15 views

What's a good way to balance costs and availability for a cluster in AWS?

We're considering AWS for a Docker Swarm which currently runs in a single datacenter. One of the reasons for moving to another provided is higher availability. The Docker Swarm cluster has 3 manager ...
1
vote
2answers
63 views

SQL Server with Pacemaker on Ubuntu 18.04, 'Resource must be configured with notify=true'

I am trying to configure Pacemaker on 3 Ubuntu machines and I am following Microsoft's instructions When done with all the cluster node are blocked and non of the resource is starting. The error I ...
0
votes
0answers
27 views

HA Cluster with PCS

I am using Ubuntu 18.04LTS. I can't seem to figure out why this cluster will not work. I believe the Corosync service is not starting. I started out with sudo pcs cluster setup --name cluster_test ...
0
votes
0answers
38 views

Load splitting. Send duplicate packets to two or more servers behind a load balancer

Is there such a thing as a load splitter instead of a load balancer? I would like for traffic that hits my load balancer to go to 2 of my real servers. Can HA proxy be configured to do this?
1
vote
1answer
37 views

Failover between two internally hosted, geographically seperate web servers [closed]

We have a web application hosted on an internal windows vm. Our company has a number of bases around the country, each with it's own server rack, and the base LANs are linked together in a big ...
0
votes
0answers
20 views

DRBD node 2 doesn't become primary when node 1 restarts heartbeat but becomes Secondary/Secondary

I have an issue with heartbeat & drbd deployment for MySQL with 2 nodes on ubuntu 18.4. It used to work fine, but now it seems like its working, node1 has floating IP, MySQL runs on node1,drbd ...
0
votes
0answers
17 views

SQL Server AlwaysOn cluster - seeding large availability database creating strange behavior

I set up a 2-node SQL Server 2016 AlwaysOn Availability Group cluster (1 primary, 1 secondary). The underlying hardware is fairly powerful; 4 CPUs, 16 GB of RAM and local-attached SSD disk. Then I ...
0
votes
0answers
33 views

HighAvailability with HAProxy, Keepalived and Lightsail Static IP

I'm trying to configure a High Availability setup utilizing HAProxy, Keepalived and AWS Lightsail. I have configured everything to the point where if I manually switch the location of the IP, ...
0
votes
0answers
34 views

linux router, 2x NIC, HA with interface bonding, two ethernet switches

I have two NIC server (eth0, eth1) that I use as router. I have two switches working in stack. Is it a good idea / possible to create on them two bond lacp interfaces ( bond0, bond1 ). And use bond0 ...
1
vote
0answers
24 views

OpenVPN server cluster - CentOS 7 - 2 VM's with Virtual IP - UDP 1194

I need to configure an ha cluster for OpenVPN server. I'm using 2 VM's behind a firewall with a public static IP. I tried to use pacemaker + corosync with virtual ip. I can connect usign SSH using ...
0
votes
0answers
13 views

why don't recommend preemption-enbale in a10

Please understand my lack of English in advance. I wonder why it is recommended to do it manually when fail over ha composition in a10. I looked up the documents, but I don't understand. I want to ...
0
votes
0answers
11 views

How to stop auto switchover from Secondary to Primary in CentOS HA?

we have configured High-Availability in CentOS machines, and its working properly switchover is working perfectly. Now our client organization wants that from the primary server to secondary server ...
0
votes
0answers
20 views

No connection to SQL Availability Group via Azure ILB IP Address from other subnet

I have 2 subnets in my vnet, where the SQL AG is placed in the inside subnet. Also configured an azure (private) internal load balancer within this subnet. I can connect to AG via SSMS within this ...
0
votes
0answers
7 views

What would be considered a **high** redo rate for an Oracle Database in logical standby configuration as compared to physical standby configurations

Considering that our 11.2.0.3 Oracle Database Active Data Guard Configuration (in Maximum Availability mode) is able to keep up with a certain amount of redo without any lag. ( 5MB/s for instance ). I ...
0
votes
0answers
40 views

FortiManager overwrites settings on HA unicast heartbeat interface

I have an HA cluster of two FortiGates (v6.0.9) managed by a FortiManager (v6.0.8). The FortiGates run in a cloud, so I must use unicast heartbeat on HA interfaces to sync them. I use port10 on both ...
0
votes
0answers
44 views

NAT and Asymetric routing

I'm stuck on a problem with NAT and Asymetric routing. I have a pair of servers (active-active) doing NAT for many public IPs. IPs are distributed among the two servers and the HA is done by ...
0
votes
0answers
83 views

HAPROXY wont start even with net.ipv4.ip_nonlocal_bind = 1

OK. This is a very old problem but with a relatively new OS. I'm running CentOS 6.10 on one server with KeepAliveD and HAPROXY and the same on two other CentOS 7.x servers. I've created an HA ...
0
votes
1answer
108 views

Linux RHEL cluster

I'm trying to setup a PCS cluster on two nodes running Red-hat, and did successfully, I want to setup syslog server (rsyslog) in Active/Passive mode. I created the cluster and added the resources, I ...
1
vote
1answer
50 views

drdb giving error when being restarted in the configuration process

I am setting up HA following this tutorial https://www.howtoforge.com/tutorial/ubuntu-drbd-heartbeat-high-availability/ but when i try to sudo systemctl restart drbd after sudo drbdadm create-md r0 it ...
2
votes
0answers
45 views

I'm getting error during HA configuration for KVM on CentOS

After adding all nodes and resource agents in my cluster I'm getting this error please someone suggest me something. Please take a look in the image-
1
vote
0answers
27 views

HA configuration for KVM Guest on iSCSI shared storage [duplicate]

My requirement is to provide HA to a Zimbra Server. We want Zimbra files to be installed in a Netapp SAN which is providing around 5.7 TB as a SAN iSCI Drive. Since Netapp comes in with Dual ...
4
votes
1answer
189 views

HA configuration for KVM machines installed on shared iSCSI storage

My requirement is to provide HA to a Zimbra Server. We want Zimbra files to be installed in a Netapp SAN which is providing around 5.7 TB as a SAN iSCI Drive. Since Netapp comes in with Dual ...
0
votes
0answers
14 views

License for OpenVPN HA [duplicate]

Currently, We have single OpenVPN EC2 instance deployed. Now we are planning to make it HA and add another EC2 instance in order to achieve this. Do we need to obtain same number of licenses for ...
0
votes
0answers
193 views

docker container resource in a pacemaker clusters fails to start

I have two-node pacemaker cluster on Centos7 with /var/lib/docker built on drbd primary/secondary resource. All resources are grouped in a group "res_group". All resources except the container ...
0
votes
2answers
161 views

warm standby NFS server failover

I'm knowingly taking a naive approach to a warm standby NFS server setup. I have two servers (CentOS 7.7) sharing a directory (not a filesystem) via NFS. This directory is kept in sync on both servers ...
0
votes
0answers
80 views

Unable to create cluster with repmgr for postgrSQL

I follow this guide to setup. https://medium.com/@victor.boissiere/how-to-setup-postgresql-cluster-with-repmgr-febc2f10c243 Everythings going fine but when come to here sudo -i -u repmgr rm -rf /...
1
vote
2answers
204 views

Highly Available PostgreSQL with patroni

I follow this guide to set up an lab for postgres HA https://www.alibabacloud.com/blog/how-to-set-up-a-highly-available-postgresql-cluster-using-patroni-on-ubuntu-16-04_594477 I follow exactly the ...
1
vote
2answers
65 views

How to make high availability web page? [closed]

When we need a high availability service (it doesn't meter what kind of service: it can be a database, a queue system, our application) we spread it info many machines to make sure when one machine is ...
4
votes
1answer
765 views

High availability for ceph storage?

Do ceph have high availability, I config 2 node like this cluster: id: 07df97db-f315-4c78-9d2a-ab85007a1856 health: HEALTH_WARN Reduced data availability: 32 pgs inactive ...
0
votes
0answers
90 views

how to create a high availability cluster using vmware on ovh hosts with vrack

i am planning to create a smal HA cluster on vmware infostructucture on two dedicated OHV hosts running in the same vrack . I have two question vmware related questions if any body have done something ...
0
votes
0answers
42 views

HA Proxy - Sticky sessions from IP:Port?

we use haproxy with round robin on a few servers which works amazingly well However now we need to use it for tcp sessions from different ports basically, gps iot devices create connections to our ...
0
votes
0answers
13 views

Is azure fault domain preserved for a VM throughout its lifetime

I want to understand if a VM in VMSS died and restarted manually will the fault domain be preserved? Similarly during updates involving live migration are fault domains preserved? There is very little ...
0
votes
1answer
23 views

Cannot connected to virutal IP loadbalancer direct to mysql server

I can't connect to the Database server though virtual IP https://towardsdatascience.com/high-availability-mysql-cluster-with-load-balancing-using-haproxy-and-heartbeat-40a16e134691 I follow this ...
0
votes
1answer
241 views

Docker container failed to run with pacemaker resource agent

I have a 2 node cluster configured on CentOS 7.6 with latest docker and pacemaker packages. I am currently trying to provide HA for couple of containers but after configuring pacemaker resource ocf:...
0
votes
1answer
261 views

How to control a service from Linux pacemaker cluster?

I have set a two node cluster on two RHEL7 virtual machines. I'm using pacemaker as my HA management software. I creates one resource for VIP and another resource for a shared FS. VIP and FS resources ...
0
votes
1answer
136 views

Corosync pacemaker Ipaddrr2 findIf failing

I've a cluster setup with 3 nodes [having nodes A,B (VIP),C] using pacemaker and corosync. When I pull network cable one of the nodes B intentionally (as a disaster recovery test), the node A or C ...
0
votes
1answer
29 views

Potential security hazards of this network topology

Long story short, we just implemented HA with 2 sonicwall nsa3600s... we only have 1 ISP connection on site... therefore we need a switch on the WAN side to split the connection off to both WAN ...
1
vote
1answer
114 views

syslog-ng configuration works in debug mode, but not without

I am trying to run syslog-ng as an OCF resource in an HA cluster. I am encountering some terribly strange behavior - when I start a single instance in debug mode, the filters match and it forwards ...
0
votes
1answer
102 views

importing ZFS pool from mirror child

I created a ZFS mirror from two disks. Then, without exporting the created pool I moved one of the disks to another system. How can I get back the data from that mirror child on a different system? I ...
0
votes
1answer
24 views

Sonicwall HA implementation with 2 buildings

I have a question about HA implementation. We're talking non-stateful failover. We have 2 NSA 3600 appliances. We have 2 buildings on-site (same lot, about 150 feet across the parking lot from each ...
0
votes
1answer
96 views

pgpool showing an extra node Node Name: Not_Set, Host Name: localhost

I have a pgpool cluster with 3 nodes, but when I query the watchdog info, from every node, I have an extra node "Node Name" Not Set, and a "Total Nodes" Count of 4. from node 1 and 2. Where the ...
1
vote
2answers
22 views

Sonicwall HA topology requirements

so in short, new boss wants me to set up our sonicwalls for HA, but given our circumstances, i dont think its possible. Any suggestions? We have 2 buildings on site. Each has a sonicwall nsa3600... ...
1
vote
0answers
205 views

Pacemaker Corosync VIP switches when node is brought online

I've a cluster setup with 3 nodes [having nodes A,B (VIP),C] using pacemaker and corosync. When I shutdown one of the nodes B intentionally (as a disaster recovery test), the node A or C takes VIP but ...
1
vote
0answers
113 views

Is it possible to establish two simultaneous keepalived VIPs to allow HAProxy load balanced HA via DNS round robin?

I'm currently investigating the use of HAProxy as a Load Balancer. I've found that the recommended configuration for HA of the HAProxy itself (not the backends) involves using keepalived to establish ...
0
votes
1answer
197 views

High availability docker swarm

I have a Docker swarm cluster running on several servers (nodes). Docker swarm is using round robin to serve requests to my services and this is working well no matter which server receives a request. ...
0
votes
0answers
500 views

systemd service in pacemaker for high availability

I came to know about the pacemaker for high availability. I have one simple service running on linux VM. I have started that using systemctl start <service name> command. I want to make this ...
-1
votes
2answers
567 views

How to setup High availability solution on DNS level? [closed]

I bought domain at namecheap and setuped at client panel my personal NS servers: ns1.example.com ns2.example.com 1) In case server ns1 unavailability, are all requests still come to ns1 or ...

1
2 3 4 5
18