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* Topic for #docker set by programmerq!~jefferya@unaffiliated/programmerq (Thu Mar  9 21:37:05 2017)
<KieronWiltshire> do I have to create a Dockerfile for each linux based operating system I want to use?
<KieronWiltshire> like do I need a Dockerfile for CentOS and a Dockerfile for ubuntu
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<selckin> not really using much of those usually with docker, so why do you want 2?
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<KieronWiltshire> selckin my application gets installed on my clients servers, some run different to others
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<ada> KieronWiltshire: no
<KieronWiltshire> so how do I install my dependencies etc automagically ada?
<KieronWiltshire> because CentOS uses yum and Ubuntu uses apt-get
<ada> KieronWiltshire: what do you mean?  your dockerfile contains the instructions to satisfy your app's dependencies
<ada> KieronWiltshire: whatever base os you use for your image, use that package manager
<ada> KieronWiltshire: once the image is built, it can run anywhere on the same architecture
<KieronWiltshire> ah I get you ada
<KieronWiltshire> so once I install the dependencies on that image
<KieronWiltshire> I can run it on any linux os?
<ada> more or less
<ada> anything with a modern kernel
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<KieronWiltshire> ada so let's say I have 3 instances of my image running
<KieronWiltshire> each with php-apache
<KieronWiltshire> that's 3 instances of apache running is it not?
<ada> sure
<KieronWiltshire> isn't that ineffective?
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<ada> ineffective for what?
<ada> it dpeends on what you're measuring
<KieronWiltshire> well isn't my OS now technically running 3 apache servers
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<ada> yes but if you don't want 3 apache servers, don't run 3 apache containers
<ada> there are valid use cases for running multiple web servers
<ada> if you don't need to, dont do it
<KieronWiltshire> okay what if I explain my problem and you see if you can provide me with a solution, because I thought docker was my answer but now I'm unsure, is that okay?
<ada> docker isn't a drop-in magic bullet - what's your end goal?
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<KieronWiltshire> Basically, we have multiple customers running on one one server and using Apache's virtual hosts to point different domains to different customers
<KieronWiltshire> so basically, imagine having our app, cloned 3 times and having 3 urls point to each dir on one apache server
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<KieronWiltshire> we'd still like to run our clients on one server but not sure how we'd go about doing so if we're running 3 apache servers
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<ada> so I would definitely recommend running separate web servers - then an outage/problem on one can't take down the business of the others
<ada> I would use a proxy like nginx or haproxy to rewrite request urls to the right container backend
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<ada> you would publish a containre for CustomerA on some port, CustomerB on another port, CustomerC on a third port - and the load balancer/proxy in front of your servers looks at the http request and forwards it to the right container
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<KieronWiltshire> wouldn't running seperate web servers be so much more costly though? we're not that big of a business
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<ada> define "costly"
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<ada> apache is free - if your customers are driving so much traffic to your servers that it grinds to a halt, its time to charge them more
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<ada> and get more servers
<KieronWiltshire> well I mean wouldn't it be more cost-effective to run on one webserver
<KieronWiltshire> true
<KieronWiltshire> okay I get you
<ada> No, I would suggest at least 3 servers
<ada> for a highly-available setup with failover
<KieronWiltshire> I think I have an idea of where we're going :)
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<ada> different web servers let you decouple therequirements of one site from the others - if apache needs configuration X for this customer, and configuration Y for this customer, you can easily do that by running multiple apache containers
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<ada> if they are all sharing the same box, same webserver, with diff vhosts, you have to configure your 1 webserver for all their requirements
<KieronWiltshire> ada
<KieronWiltshire> what would I do about the database?
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<KieronWiltshire> our database was originally on the same server
<ada> I would run a separate database server
<ada> either in containers or bare metal
<KieronWiltshire> wouldnt it be slow for our clients in america though if we hosted it in europe
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<ada> yeah but containers have nothing to do withthat
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<KieronWiltshire> how could I speed up our database for clients that are a fair distance away
<KieronWiltshire> if I had one database server?
<ada> run a server geographically close to your customers
<ada> use a content delivery network to speed up static content
<ada> like cloudflare
<KieronWiltshire> 1 server?
<ada> 1 server, what?
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<KieronWiltshire> well I have clients in america and europe
<KieronWiltshire> more in europe
<KieronWiltshire> so my database would be awesome for europeans
<KieronWiltshire> but terrible for americans right?
<ada> "terrible" is a strong word
<KieronWiltshire> you know what i mean :)
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<ada> do you have real data on performance in america vs europe?
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<KieronWiltshire> nope
<ada> like actual data you can use right now
<KieronWiltshire> just trying to build for the future
<ada> then dont optimize for that variable ahead of time
<KieronWiltshire> okay