Marco Giuntini also has some experience with Terraform, is it right Marco? I am not the expert on this front, I'm open to suggestions. We need a tool which allows us to configure an instance. I like ansible-openwisp2 because I use a playbook or a series of playbooks for an installation, for example:
- a playbook for all the openwisp configurations, with additional tasks and roles for postgresql, freeradius, login page etc. - a playbook for the openvpn server I like the fact that most of the configurations are in YAML format and I can easily understand the configuration of an installation by looking at the YAML. The problem is that it is not simple to support horizontal scaling and that it become a pain to maintain over time. For example, if you have installed an OpenWISP instance on Ubuntu 16 LTS and then you have to migrate to Ubuntu 18 LTS, you create a new VM, run the playbooks there, pray that it works, most of the time it won't work out of the box and then you have to spend 1 day or more to fix the issues that come up, which may happen in other roles that you don't control and then you have to fork them and patch them, send pull requests to the maintainers which will take 1 month on average to merge it. Or if you have a custom module, maybe to deploy it you have to execute additional tasks that may conflict with other previous tasks and you find out only when you deploy. And if someone with access to the VM has made some manual editing... you risk overwriting something they did. With docker instead, if you migrate to a new OS, you work on the images (which can be also painful, but if something breaks you find out soon during testing, not when you deploy) and when the images compile successfully you can run a full instance locally and test it before deploying. Same applies when you add custom modules by extending a docker image (eg: use it as a base). The good thing is the immutability of the result and the fact that as soon as a system package or a python dependency needs to be upgraded, you generate a new image, you bring up new containers and the old ones die. No manual configurations can be made, because the services are ephemeral (will be thrown away) by definition, everything can be and must be replaced easily, which means can also be replicated and scaled up very easily. So the ideal situation is one in which: - we can manage most configurations of the services in some textual format - we can manage the django settings easily for a single installation (in which different containers may have mostly identical django settings with some minor differences, django has a way to specify default settings, we could use that low level feature for example) - we can store all these configs under git in private repos On Tue, Mar 26, 2019 at 2:14 PM A Stanley <[email protected]> wrote: > Terraform.io may also be an option. I've had some success with it and > Docker/Ansible and it has support for Kubernetes. > > On Tue, Mar 26, 2019, 1:56 PM Marco Giuntini <[email protected]> > wrote: > >> Hi, >> >> https://github.com/ansible/awx is not a tool but it is an example on how >> Ansible AWX project uses docker and ansible to deploy and configure the >> application. >> >> Regards, >> >> -- >> Marco Giuntini >> GTalk: [email protected] >> Skype: hispanico70420 >> Twitter: @Hispanico81 >> PGP Key ID: BD774009 >> >> >> On Tue, 26 Mar 2019 at 17:25, Federico Capoano < >> [email protected]> wrote: >> >>> A demo on Kubernetes and using some kind of tool that makes it easy to >>> provision (Marco Giuntini suggested https://github.com/ansible/awx, if >>> you know something equivalent you could suggest) would be a big win. >>> >>> Helping out in writing tests (using some sort of mock SSH server) for >>> https://github.com/openwisp/openwisp-controller/pull/31 is also a big >>> plus, because if the students really understand the code of that branch it >>> will have an easier time to understand how to deploy it, I have some >>> automated test samples that I can show if needed. >>> >>> Federico >>> >>> >>> On Tue, Mar 26, 2019 at 11:31 AM Ajay Tripathi <[email protected]> >>> wrote: >>> >>>> Hi, >>>> >>>> On Monday, March 25, 2019 at 7:25:05 PM UTC+5:30, Federico Capoano >>>> wrote: >>>>> >>>>> Yes, but we also want to allow to scale horizontally more easily, so >>>>> the traffic can be dispatched to more instances of the same containers if >>>>> needed (imagine a kubernetes cluster spread on multiple nodes). >>>>> >>>> >>>> Great. I made a docker swarm stack and tested horizontal scaling of my >>>> prototype of the docker-compose. I understand the requirement better now. >>>> **The mentioned docker-compose stack is a simple openwisp container and >>>> a redis container. >>>> >>>> >>>>> The Admin interface is used ony by administrators, not very often, so >>>>> we likley won't need more instances of the same containers to scale. >>>>> The load on the other services increases with the size of the network >>>>> (number of devices or also number of users in the case of the radius >>>>> module), so we will need to scale up with those. >>>>> >>>> >>>> Thanks for clearing that up. >>>> >>>> >>>>> each module has its own URLs and APIs that are not admin related which >>>>> are used to provide configurations, update the network topology, >>>>> communicate with freeradius and so on, each one of these group of features >>>>> should run in isolation. >>>>> >>>> A more realistic scenario is a user who wants to use only admin + >>>>> radius module, or admin + controller module. >>>>> But we should not add restrictions on which containers the users want >>>>> to use because we should consider this to be a base on which users and >>>>> developers can build a solution tailored to their needs with custom >>>>> modules. >>>>> >>>> django-channels is the framework with which you build the websocket >>>>> server, but the actual logic that allows you to do anything with the >>>>> websocket is in OpenWISP. >>>>> At the moment only OpenWISP Controller has some websocket logic >>>>> (inherited from django-loci) but in the future we will have more. >>>>> >>>> >>>>> The duty of this container is to serve the websocket server and >>>>> process data coming from websocket clients. >>>>> >>>>> Immagine the same installation we have today, but instead of having it >>>>> on a single VM, we have it spread on different containers, each container >>>>> dedicated to a single service: the containers which receive more traffic >>>>> can be scaled up, either vertically with more resources (RAM, CPU) or >>>>> horizontally with more containers if possible (if a load balancer in front >>>>> of the containers is available to distribute traffic, we can do this with >>>>> nginx for all the containers which serve HTTP or WebSocket requests, with >>>>> the celery containers we don't need a load balancer because they read from >>>>> the broker service which in our case is redis by default). >>>>> >>>> >>>> That explained some crucial points to help me understand! :) >>>> >>>> >>>>> I hope is clearer now! >>>>> >>>> >>>> Yes, thank you. Currently, I am reading more on the same. :) >>>> I am making a prototype with some of the features for understanding >>>> further, I am working on the features in whichever order I feel is most >>>> important for complete understanding. >>>> Please let me know if there is a specific requirement of the prototype >>>> that you'd like to see before the deadline so that I can focus on that >>>> first. >>>> >>>> Ajay >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "OpenWISP" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "OpenWISP" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> For more options, visit https://groups.google.com/d/optout. >>> >> -- >> You received this message because you are subscribed to the Google Groups >> "OpenWISP" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> For more options, visit https://groups.google.com/d/optout. >> > -- > You received this message because you are subscribed to the Google Groups > "OpenWISP" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "OpenWISP" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
