etcd-pod: Use ionice -c2 -n0

This will have no currect effect with the default I/O scheduler of `mq-deadline`, but I think it will help once we switch to `bfq` as part of openshift/machine-config-operator#1946
openshift · Aug 6, 2020 · e1dae76 · e1dae76
1 parent f4022a2
commit e1dae76
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diff --git a/bindata/etcd/pod.yaml b/bindata/etcd/pod.yaml
@@ -151,7 +151,8 @@ ${COMPUTED_ENV_VARS}
         env | grep ETCD | grep -v NODE
 
         set -x
-        exec etcd \
+        # See https://etcd.io/docs/v3.4.0/tuning/ for why we use ionice
+        exec ionice -c2 -n0 etcd \
           --initial-advertise-peer-urls=https://${NODE_NODE_ENVVAR_NAME_IP}:2380 \
           --cert-file=/etc/kubernetes/static-pod-certs/secrets/etcd-all-serving/etcd-serving-NODE_NAME.crt \
           --key-file=/etc/kubernetes/static-pod-certs/secrets/etcd-all-serving/etcd-serving-NODE_NAME.key \

diff --git a/pkg/operator/etcd_assets/bindata.go b/pkg/operator/etcd_assets/bindata.go