Chapter 5. Kernel parameters

ParameterDescription

BridgeNfCallArpTables

Configures sysctl net.bridge.bridge-nf-call-arptables key. The default value is 1.

BridgeNfCallIp6Tables

Configures sysctl net.bridge.bridge-nf-call-ip6tables key. The default value is 1.

BridgeNfCallIpTables

Configures sysctl net.bridge.bridge-nf-call-iptables key. The default value is 1.

ExtraKernelModules

Hash of extra kernel modules to load.

ExtraKernelPackages

List of extra kernel related packages to install.

ExtraSysctlSettings

Hash of extra sysctl settings to apply.

InotifyIntancesMax

Configures sysctl fs.inotify.max_user_instances key. The default value is 1024.

KernelDisableIPv6

Configures sysctl net.ipv6.{default/all}.disable_ipv6 keys. The default value is 0.

KernelIpForward

Configures net.ipv4.ip_forward key. The default value is 1.

KernelIpNonLocalBind

Configures net.ipv{4,6}.ip_nonlocal_bind key. The default value is 1.

KernelPidMax

Configures sysctl kernel.pid_max key. The default value is 1048576.

NeighbourGcThreshold1

Configures sysctl net.ipv4.neigh.default.gc_thresh1 value. This is the minimum number of entries to keep in the ARP cache. The garbage collector will not run if there are fewer than this number of entries in the cache. The default value is 1024.

NeighbourGcThreshold2

Configures sysctl net.ipv4.neigh.default.gc_thresh2 value. This is the soft maximum number of entries to keep in the ARP cache. The garbage collector will allow the number of entries to exceed this for 5 seconds before collection will be performed. The default value is 2048.

NeighbourGcThreshold3

Configures sysctl net.ipv4.neigh.default.gc_thresh3 value. This is the hard maximum number of entries to keep in the ARP cache. The garbage collector will always run if there are more than this number of entries in the cache. The default value is 4096.