[lxc-users] multi unprivileged containers running tomcat7

[Serge Hallyn]

Quoting Morten Steffensen (msteff at emercos.com):
> This is how i created the containers:

Aha, thanks.

> host: ubuntu 14.04 minimal
> 
> root>apt-get install lxc
> root>groupadd lxc-adm (groupid 1000)
> root>adduser --gid 1000 --home /home/lxcuser lxcuser
> root>echo "lxcuser veth lxcbr0 2" | tee -a /etc/lxc/lxc-usernet

That lets you connect two veths to lxcbr0,

> lxcuser>mkdir -p ~/.config/lxc
> lxcuser>echo "lxc.id_map = u 0 100000 65536" > ~/.config/lxc/default.conf
> lxcuser>echo "lxc.id_map = g 0 100000 65536" >> ~/.config/lxc/default.conf
> lxcuser>echo "lxc.network.type = veth" >> ~/.config/lxc/default.conf
> lxcuser>echo "lxc.network.link = lxcbr0" >> ~/.config/lxc/default.conf
> 
> 
> 
> 
> /etc/lxc/dnsmasq.conf
>     dhcp-host=tomcat1,10.0.3.101
>     dhcp-host=tomcatmysql2,10.0.3.102
>     dhcp-host=tomcatmysql3,10.0.3.103
> 
> /etc/default/lxc-net
>     USE_LXC_BRIDGE="true"
>     LXC_BRIDGE="lxcbr0"
>     LXC_ADDR="10.0.3.1"
>     LXC_NETMASK="255.255.255.0"
>     LXC_NETWORK="10.0.3.0/24"
>     LXC_DHCP_RANGE="10.0.3.2,10.0.3.254"
>     LXC_DHCP_MAX="253"
>     LXC_DHCP_CONFILE=/etc/lxc/dnsmasq.conf
> 
> lxcuser>lxc-create -t download -n tomcat1 -- -d ubuntu -r trusty -a i386
> lxcuser>lxc-start -n tomcat1 -d
> 
> lxcuser>ssh ubuntu at 10.0.3.101
> ubuntu at 10.0.3.101>sudo apt-get update
> ubuntu at 10.0.3.101>sudo apt-get upgrade
> ubuntu at 10.0.3.101>sudo apt-get install default-jdk
> ubuntu at 10.0.3.101>sudo apt-get install tomcat7
> lxcuser>lxc-stop -n tomcat1
> 
> lxcuser>lxc-clone -o tomcat1 -n tomcatmysql2
> lxcuser>lxc-start -n tomcatmysql2 -d
> lxcuser>ssh ubuntu at 10.0.3.102
> ubuntu at 10.0.3.102>sudo apt-get install mysql-server-5.6
> lxcuser>lxc-stop -n tomcatmysql2
> 
> lxcuser>lxc-clone -o tomcatmysql2 -n tomcatmysql3
> lxcuser>lxc-start -n tomcatmysql3 -d

that's one veth,

> lxcuser>lxc-start -n tomcatmysql2 -d

that's two,

> lxcuser>lxc-start -n tomcat1 -d

that would be a third :)

> lxc_container: command get_cgroup failed to receive response
> 
> 
> Apparently it works sometimes.. i thought it was the problem with 2
> tomcat instances, then i thought it was 2 mysql, but it seems to be
> related to something else. It is not a consequently error.
> 
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