On 8/24/21 6:46 PM, William Edwards wrote:
I think the general concensus is that containerisation isn't always
better than 'normal' VMs. 'Easy deployment & scaling' is also perfectly
possible without containers.
Without a doubt VMs are a good solution. Containers use some of the same
technology however and since they're based on the Linux kernel API they
can do it with a bit more performance (as opposed to emulating
hardware). While the performance hit for a VM is small, most of the
folks who use containers are trying to squeeze as many apps in a
"multi-tenant" host which means every CPU cycle matters.
Also, with recent CGROUPS 2 changes there's the ability to nest containers.
I think overall containers offer a "capability based" paradigm while VMs
offer an emulation paradigm. In theory the capability based paradigm
ought to be easier to use and more flexible so it's reasonable that
folks want to use it for things like Dovecot.
MRob schreef op 2021-08-25 00:01:
Thank to other responses with links that i'll learning from! Thanks
you very much
On 2021-08-24 00:35, Marc wrote:
What are you trying to achieve with containerizing?
hmm, easy deployment & scaling? also reslient against hardware
crashes, etc.
You have to take into account that your
storage is persistant,
Persistent storage is definitely something to think about and plan for
but most containerization solutions offer easy ways to mount persistent
storage into containers. This can be an advantage, your business logic
can run in the container to which you ascribe a certain amount of CPU
per your needs and your persistent data can live on the host file system.
Have you see what challenge this poses? Love to hear your opinion
about it. Maybe this is where using object-storage backend becomes
more powerful solution?
you have to take into account getting something
like proxy to redirect traffic etc etc.
Indeed, ingress and egress as well as networking become more complex.
Yes I thought also proxy/director also become containerized. You said
this for teaching a certain point?
If you want to
deploy the container on a orchestrator so it is going to be
(re)started on a random hosts.
you mention so because all hosts must be connected to same storage?
I managed to get this to work
via alpine linux (nice small), but I think I am going back to vm.
what reasons? what kind of vm do you use?
Hello, anyone here has containerized dovecot? Can I ask general advice
and experience please? are there any recommended articles/tutorial for
containerize deploymnt and auto-scaling? Thank you.
Cheers,
Jeremiah
