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Util-vserver:SplitSharedNetworks
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= Applied namespace ramblings = == The Script == This script should be symlinked from /etc/vservers/<name>/scripts/(initialiaze,prepre-start...).d . <PRE> function createMacVidId() { ( printf "02" printf "%04x" $1 # I usually use VID printf "%04x" $S_CONTEXT printf "%02x" $2 # IFACE number f.i. )| sed 's/\(..\)\(..\)\(..\)\(..\)\(..\)\(..\)/\1:\2:\3:\4:\5:\6/' } function usesipnetns() { local netspace if [ -s "$VSERVER_DIR/spaces/net" ] then read netspace < "$VSERVER_DIR/spaces/net" [ "$netspace" = "$VSERVER_NAME" ] return $? fi return 1 } case "${1}" in initialize) if usesipnetns then _HIP="$_IP" _IP="$_HIP netns exec ${2} $_HIP" $_HIP netns add ${2} $_IP link set dev lo up fi ;; prepre-start) if usesipnetns then $_HIP link add link eth0 name fw-vlan2 type vlan id 2 $_HIP link set dev fw-vlan2 address $(createMacVidId 2 0) $_HIP link set dev fw-vlan2 netns ${2} $_HIP netns exec ${2} $_VPROCUNHIDE fi ;; # By now all options are generated, time to override them pre-start) # NICE_CMD=(/sbin/ip netns exec ${2} "${NICE_CMD[@]}") if usesipnetns then local index local NEWVSPACE_CMDS declare -a NEWVSPACE_CMDS index=0; while [ $index -lt ${#VSPACE_SHARED_CMD[@]} ] do if [ "${VSPACE_SHARED_CMD[$((${index}+0))]}" = "$_VSPACE" ] && [ "${VSPACE_SHARED_CMD[$((${index}+1))]}" = "--enter" ] && [ "${VSPACE_SHARED_CMD[$((${index}+2))]}" = "${2}" ] && [ "${VSPACE_SHARED_CMD[$((${index}+3))]}" = "--net" ] then NEWSPACE_CMDS=("${NEWSPACE_CMDS[@]}" $_HIP netns exec "$2") index=$(($index+5)) else NEWSPACE_CMDS=("${NEWSPACE_CMDS[@]}" "${VSPACE_SHARED_CMD[$index]}") index=$(($index+1)) fi done VSPACE_SHARED_CMD=("${NEWSPACE_CMDS[@]}") unset NEWVSPACE_CMDS unset index fi ;; post-start) ;; pre-stop) if usesipnetns then _HIP=_IP _IP="$_HIP netns exec ${2} $_HIP" $_HIP netns add ${2} $_IP link set dev lo up fi ;; post-stop) $_IP link del fw-vlan2 $_HIP netns delete ${2} ;; esac </PRE> == Explanation == The script uses a configuration fault (e.g: <vserver>/spaces/net contains it's own name) to indicate that the script should create the network namespace. Actually util-vserver will think that it is using a shared network namespace, and we replace that incantation of vspace with our own. You are expected to create and give the interfaces in the prepre-start section. Standard util-vserver functionality can configure those interfaces by prefixing $_IP with the vspace or ip netns prefix. This way, the interfaces are UP *and* RUNNING before the vserver itself starts, hence making it ideal for f.i. DHCP servers on dedicated vlans. Configuration issues: for the script to work you now have to have the right /run/netns/vserver-name in the /etc/vserver-name/namespace-cleanup-skip file. == future == I will add functionality to allow shared network namespaces. It's not that hard.
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