Class: Tadpole

Inherits:
Object
  • Object
show all
Defined in:
lib/sapoku.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, stack = "ruby") ⇒ Tadpole

create a new container stub (then requires saving)



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# File 'lib/sapoku.rb', line 34

def initialize(name, stack = "ruby")
	@container_ip = getfreeip
	@local_port = getlocalport
	@app_name = name
	@stack = stack
	@ram = 512
end

Instance Attribute Details

#app_name ⇒ Object

Returns the value of attribute app_name.



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# File 'lib/sapoku.rb', line 5

def app_name
  @app_name
end

#container_ip ⇒ Object

Returns the value of attribute container_ip.



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# File 'lib/sapoku.rb', line 5

def container_ip
  @container_ip
end

#local_port ⇒ Object

Returns the value of attribute local_port.



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# File 'lib/sapoku.rb', line 5

def local_port
  @local_port
end

#ram ⇒ Object

Returns the value of attribute ram.



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# File 'lib/sapoku.rb', line 5

def ram
  @ram
end

#stack ⇒ Object

Returns the value of attribute stack.



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# File 'lib/sapoku.rb', line 5

def stack
  @stack
end

#userid ⇒ Object

Returns the value of attribute userid.



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# File 'lib/sapoku.rb', line 5

def userid
  @userid
end

Class Method Details

.all ⇒ Object

returns an array of known Tadpoles - doesn’t scale, obviously



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# File 'lib/sapoku.rb', line 23

def self.all
	tadpoles = `sudo lxc-ls -1`.split(/\n/).uniq
	output = []
	for t in tadpoles do
		pole = self.find(t)
		output << pole if !pole.nil?
	end
	return output
end

.find(name) ⇒ Object

return an instance based on a given name, if it exists



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# File 'lib/sapoku.rb', line 9

def self.find(name)
	# if this is false, return nil
	return nil if !$redis.hexists(name, "ip")

	tadpole = self.new(name)
	tadpole.container_ip = $redis.hget(name, "ip")
	tadpole.local_port = $redis.hget(name, "localport")
	tadpole.userid = $redis.hget(name, "userid")
	tadpole.ram = $redis.hget(name, "ram")
	tadpole.stack = $redis.hget(name, "stack")
	return tadpole
end

Instance Method Details

#bootstrap ⇒ Object

actually creates and initializes the container returns the actual raw console output of the generated commands



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# File 'lib/sapoku.rb', line 71

def bootstrap
	self.save
	output = "Creating new container for your app using the #{@stack} stack"
	output += `sudo lxc-clone -o #{@stack} -n #{@app_name}`
	output += "Applying new config file to container"
	create_interfaces_file
	create_lxc_config
	output += "Booting your new container"
	output += `sudo lxc-start -n #{@app_name} -d`
	create_iptables
	output += "Creating nginx configuration file"
	create_nginx_config
	output += "Rehashing nginx configuration"
	rehash_nginx
	return output
end

#create_interfaces_file ⇒ Object 



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# File 'lib/sapoku.rb', line 102

def create_interfaces_file
	@ip = self.container_ip
	@name = self.app_name

	template = %{
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
address #{@ip}
netmask 255.255.255.0
gateway 10.0.3.1
}

	erb = ERB.new(template)

	File.open("#{@name}_interfaces", 'w') do |f|
		f.write erb.result(self.get_binding)
	end

	system("sudo mv #{@name}_interfaces /var/lib/lxc/#{@name}/rootfs/etc/network/interfaces")
end

#create_iptables ⇒ Object

create the new iptables rule to fwd accesses into the container



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# File 'lib/sapoku.rb', line 225

def create_iptables
	system("sudo iptables -t nat -A PREROUTING -p tcp --dport #{@local_port} -j DNAT --to-destination #{@container_ip}:8080")
end

#create_lxc_config ⇒ Object

generate a new config file



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# File 'lib/sapoku.rb', line 160

def create_lxc_config
	@ip = self.container_ip
	@ram = self.ram
	@name = self.app_name

	template = %{
lxc.utsname = <%= @name %>
lxc.mount = /var/lib/lxc/<%= @name %>/fstab
lxc.rootfs = /var/lib/lxc/<%= @name %>/rootfs

# networking
lxc.network.type=veth
lxc.network.flags=up
lxc.network.link=lxcbr0
#lxc.network.hwaddr=00:16:3e:85:68:c1
lxc.network.name = eth0
lxc.network.ipv4=<%= @ip %>

lxc.devttydir = lxc
lxc.tty = 4
lxc.pts = 1024
lxc.arch = amd64
lxc.cap.drop = sys_module mac_admin
lxc.pivotdir = lxc_putold

lxc.cgroup.memory.limit_in_bytes = <%= @ram %>M

# uncomment the next line to run the container unconfined:
#lxc.aa_profile = unconfined

lxc.cgroup.devices.deny = a
# Allow any mknod (but not using the node)
lxc.cgroup.devices.allow = c *:* m
lxc.cgroup.devices.allow = b *:* m
# /dev/null and zero
lxc.cgroup.devices.allow = c 1:3 rwm
lxc.cgroup.devices.allow = c 1:5 rwm
# consoles
lxc.cgroup.devices.allow = c 5:1 rwm
lxc.cgroup.devices.allow = c 5:0 rwm
#lxc.cgroup.devices.allow = c 4:0 rwm
#lxc.cgroup.devices.allow = c 4:1 rwm
# /dev/{,u}random
lxc.cgroup.devices.allow = c 1:9 rwm
lxc.cgroup.devices.allow = c 1:8 rwm
lxc.cgroup.devices.allow = c 136:* rwm
lxc.cgroup.devices.allow = c 5:2 rwm
lxc.cgroup.devices.allow = c 254:0 rwm
lxc.cgroup.devices.allow = c 10:229 rwm
lxc.cgroup.devices.allow = c 10:200 rwm
lxc.cgroup.devices.allow = c 1:7 rwm
lxc.cgroup.devices.allow = c 10:228 rwm
lxc.cgroup.devices.allow = c 10:232 rwm
}

	erb = ERB.new(template)

	File.open("#{@name}_config", 'w') do |f|
		f.write erb.result(self.get_binding)
	end

	system("sudo mv #{@name}_config /var/lib/lxc/#{@name}/config")
end

#create_nginx_config ⇒ Object 



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# File 'lib/sapoku.rb', line 126

def create_nginx_config
	@ip = self.container_ip
	@ram = self.ram
	@name = self.app_name

	template = %{
		server {
			listen 80;
			server_name #{@name}.sapoku.webreakstuff.com;
			access_log off;
			error_log off;

			location / {
				proxy_pass http://#{@ip}:8080;
				proxy_set_header X-Real-IP $remote_addr;
			}
		}
	}

	erb = ERB.new(template)

	File.open("#{@name}_nginx_config", 'w') do |f|
		f.write erb.result(self.get_binding)
	end

	system("sudo mv #{@name}_nginx_config /opt/nginx/conf/containers/#{@name}.conf")
end

#destroy ⇒ Object

wipes a container from HDD and redis



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# File 'lib/sapoku.rb', line 52

def destroy
	# delete the hash from redis
	$redis.del(@app_name)
	# add the ip back to our free ips list
	$redis.sadd("sapoku:freeips", @container_ip)
	`sudo lxc-stop -n #{@app_name}`
	`sudo lxc-destroy -n #{@app_name}`
	`sudo rm /opt/nginx/conf/containers/#{@app_name}.conf`
end

#get_binding ⇒ Object 



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# File 'lib/sapoku.rb', line 98

def get_binding
	binding
end

#getfreeip ⇒ Object

returns a free IP to be used by the container being bootstrapped



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# File 'lib/sapoku.rb', line 89

def getfreeip
	$redis.spop("sapoku:freeips")
end

#getlocalport ⇒ Object

return a free port to be used to forward external->internal requests



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# File 'lib/sapoku.rb', line 94

def getlocalport
	$redis.spop("sapoku:freeports")
end

#rehash_nginx ⇒ Object

reload nginx configuration



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# File 'lib/sapoku.rb', line 155

def rehash_nginx
	`sudo kill -HUP $(cat /opt/nginx/logs/nginx.pid)`
end

#running? ⇒ Boolean

returns true if the instance is running

Returns:

  • (Boolean) 


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# File 'lib/sapoku.rb', line 63

def running?
	$regex = /RUNNING/
	return false if $regex.match(`sudo lxc-info -n #{@app_name}`).nil?
	return true
end

#save ⇒ Object

creates and saves the new container



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# File 'lib/sapoku.rb', line 43

def save
	$redis.hset(@app_name, "ip", @container_ip)
	$redis.hset(@app_name, "localport", @local_port)
	$redis.hset(@app_name, "userid", @userid)
	$redis.hset(@app_name, "ram", @ram)
	$redis.hset(@app_name, "stack", @stack)
end