Active-Active vs Active-Passive Cluster to Achieve High Availability in Scaling Systems

You just perfectly explained everything 😊

I loved your explanation. One good thing that I like about having Active-Passive for Cloud Workloads, you remediate the con of secondary backup server/service contributing towards your infrastructure price even if it's not running however with cloud for instance Lambda if that's your secondary server in Active-Passive, you will not be charged because you pay for what you use, i.e as AWS Lambda charges for execution and Duration only, if it's not getting triggered with request, you will not incur any cost and hence Active-Passive is really a great approach to maintain multi-region resiliency specifically in AWS Cloud.

in aws what will be VRRP .. is it subnet value?

Great video

Thank you for the easy explanation

why do you clap in you videos!!

Wow your explanation of complex network concepts into easy-to-understand videos are amazing! Keep up the good work!

Great video! Thank you. Is there any difference at all between Active/Active and Fault tolerant systems ? Both can involve ARP/VIPs and both involves stacking up servers for redundancy in general....

Nice video to explain what active active is! Helped in my job caz I hv no technical background

when i configure my servers using nginx and keepalived my request goes to one server only ant help with that
Note im using active active HA

great tuto hussein thank you , can u tell me how can I become a member in the channel to watch all the content ? :D

great
how about little bit of Quorem ?

I learnt more in 7 days here than 4 years of university x/

Excellent blog for better SE

Very good tutorial, thank you for putting this together and sharing with the audience. Very informative. Awesome job.

If my understandig is correct, failover on active-passive may take a fraction of a second .i.e. the moment master node stops advertising, backup will assign itself the VIP and this process can take as little as milliseconds with keepalived. However, in the case of the active-active where the failover is being handled by the DNS server, it becomes dependent on the DNS's TTL value and can take much longer (recommended TTL is 30 seconds) to recover. By that logic, the failover handling becomes a disadvantage of the active-active. Would you agree?

what if we have different haproxy in the different network ?

Hi ..my question is not related to this topic . My question is what is the difference between agile and devops? Can somebody follow both at same time ? Or should I follow only one ? Please reply I am totally confused.

You may want to learn better about how VIP addresses work. It is NOT REALLY through ARP, as the clients never see any change and the magic happens in the IP stack of the master and backup nodes:

The master node will assign the VIP to its network card and put a IANA MAC address on it. Then it advertises itself as master, which the backup node will see and will know the master is still alive.

When the backup node stops seeing the advertisements from the master node, it will then assign the VIP to its network card, with that same IANA MAC address.

So it is NOT REALLY ARP, as the clients NEVER see a change in MAC address, but it is the Ethernet switch the ONE that knows which port has that IANA MAC address and simply forwards the packets there.