lxc-net: add LXC_DHCP_PING boolean option

Excerpt from dnsmasq(8): By default, the DHCP server will attempt to ensure that an address in not in use before allocating it to a host. It does this by sending an ICMP echo request (aka "ping") to the address in question. If it gets a reply, then the address must already be in use, and another is tried. This flag disables this check. This is useful if one expects all the containers to get an IP address from the LXC authoritative DHCP server and wants to speed up the process of getting a lease. Signed-off-by: Jonathan Calmels <jcalmels@nvidia.com>

lxc-net: add LXC_DHCP_PING boolean option
bbb8e190 · Jonathan Calmels · 84bf5645 · bbb8e190
Commit bbb8e190 authored Dec 07, 2017 by Jonathan Calmels
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lxc-net.in config/init/common/lxc-net.in +7 -1

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--- a/config/init/common/lxc-net.in
+++ b/config/init/common/lxc-net.in
@@ -16,6 +16,7 @@ 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=""
+LXC_DHCP_PING="true"
 LXC_DOMAIN=""

 LXC_IPV6_ADDR=""
@@ -127,7 +128,12 @@ start() {
        fi
    done

-    dnsmasq $LXC_DHCP_CONFILE_ARG $LXC_DOMAIN_ARG -u ${DNSMASQ_USER} \
+    LXC_DHCP_PING_ARG=""
+    if [ "x$LXC_DHCP_PING" = "xfalse" ]; then
+        LXC_DHCP_PING_ARG="--no-ping"
+    fi
+
+    dnsmasq $LXC_DHCP_CONFILE_ARG $LXC_DOMAIN_ARG $LXC_DHCP_PING_ARG -u ${DNSMASQ_USER} \
            --strict-order --bind-interfaces --pid-file="${varrun}"/dnsmasq.pid \
            --listen-address ${LXC_ADDR} --dhcp-range ${LXC_DHCP_RANGE} \
            --dhcp-lease-max=${LXC_DHCP_MAX} --dhcp-no-override \