kubernetes: add sysctl.d configuration

The startup of kubernetes relies on some kernel/runtime configuration.
We create a sysctl.d snippet to ensure that critical ones are set when
installing our packages.

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

2 files changed, 6 insertions, 1 deletions

diff --git a/recipes-containers/kubernetes/kubernetes/99-kubernetes.conf b/recipes-containers/kubernetes/kubernetes/99-kubernetes.conf
new file mode 100644
index 00000000..89331ca2
--- /dev/null
+++ b/recipes-containers/kubernetes/kubernetes/99-kubernetes.conf
@@ -0,0 +1 @@
+net.ipv4.ip_forward                 = 1
diff --git a/recipes-containers/kubernetes/kubernetes_git.bb b/recipes-containers/kubernetes/kubernetes_git.bb
index 7cdef2c7..949f3076 100644
--- a/recipes-containers/kubernetes/kubernetes_git.bb
+++ b/recipes-containers/kubernetes/kubernetes_git.bb
@@ -32,6 +32,7 @@ SRC_URI:append = " \
            file://0001-Makefile.generated_files-Fix-race-issue-for-installi.patch \
            file://cni-containerd-net.conflist \
            file://k8s-init \
+           file://99-kubernetes.conf \
           "
 
 DEPENDS += "rsync-native \
@@ -105,6 +106,9 @@ do_install() {
     if ${@bb.utils.contains('DISTRO_FEATURES','systemd','true','false',d)}; then
         install -d "${D}${BIN_PREFIX}/bin"
         install -m 755 "${WORKDIR}/k8s-init" "${D}${BIN_PREFIX}/bin"
+
+        install -d ${D}${sysconfdir}/sysctl.d
+        install -m 0644 "${WORKDIR}/99-kubernetes.conf" "${D}${sysconfdir}/sysctl.d"
     fi
 }
 
@@ -135,7 +139,7 @@ SYSTEMD_AUTO_ENABLE:kubelet = "enable"
 
 FILES:kubectl = "${bindir}/kubectl"
 FILES:kube-proxy = "${bindir}/kube-proxy"
-FILES:${PN}-misc = "${bindir}"
+FILES:${PN}-misc = "${bindir} ${sysconfdir}/sysctl.d"
 
 ALLOW_EMPTY:${PN}-host = "1"
 FILE:${PN}-host = "${BIN_PREFIX}/bin/k8s-init"