4ce334aa49
With go RWMutex design, no goroutine should expect to be able to acquire a read lock until the read lock has been released, if one goroutine call lock. The original design is to reload cni network config on every single Status CRI gRPC call. If one RunPodSandbox request holds read lock to allocate IP for too long, all other RunPodSandbox/StopPodSandbox requests will wait for the RunPodSandbox request to release read lock. And the Status CRI call will fail and kubelet becomes NOTReady. Reload cni network config at every single Status CRI call is not necessary and also brings NOTReady situation. To lower the possibility of NOTReady, CRI will reload cni network config if there is any valid fs change events from the cni network config dir. Signed-off-by: Wei Fu <fuweid89@gmail.com>
70 lines
2.2 KiB
Go
70 lines
2.2 KiB
Go
// +build !windows
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/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package server
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import (
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cni "github.com/containerd/go-cni"
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runcsystem "github.com/opencontainers/runc/libcontainer/system"
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"github.com/opencontainers/selinux/go-selinux"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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)
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// networkAttachCount is the minimum number of networks the PodSandbox
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// attaches to
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const networkAttachCount = 2
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// initPlatform handles linux specific initialization for the CRI service.
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func (c *criService) initPlatform() error {
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var err error
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if runcsystem.RunningInUserNS() {
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if !(c.config.DisableCgroup && !c.apparmorEnabled() && c.config.RestrictOOMScoreAdj) {
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logrus.Warn("Running containerd in a user namespace typically requires disable_cgroup, disable_apparmor, restrict_oom_score_adj set to be true")
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}
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}
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if c.config.EnableSelinux {
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if !selinux.GetEnabled() {
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logrus.Warn("Selinux is not supported")
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}
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} else {
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selinux.SetDisabled()
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}
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// Pod needs to attach to at least loopback network and a non host network,
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// hence networkAttachCount is 2. If there are more network configs the
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// pod will be attached to all the networks but we will only use the ip
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// of the default network interface as the pod IP.
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c.netPlugin, err = cni.New(cni.WithMinNetworkCount(networkAttachCount),
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cni.WithPluginConfDir(c.config.NetworkPluginConfDir),
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cni.WithPluginMaxConfNum(c.config.NetworkPluginMaxConfNum),
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cni.WithPluginDir([]string{c.config.NetworkPluginBinDir}))
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if err != nil {
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return errors.Wrap(err, "failed to initialize cni")
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}
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return nil
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}
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// cniLoadOptions returns cni load options for the linux.
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func (c *criService) cniLoadOptions() []cni.CNIOpt {
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return []cni.CNIOpt{cni.WithLoNetwork, cni.WithDefaultConf}
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}
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