Merge pull request #695 from miaoyq/add-doc-for-config

Add a document for cri plugin config

docs/config.md

@@ -0,0 +1,70 @@
+# CRI Plugin Config Guide
+This document provides the description of the CRI plugin configuration.
+
+The explanation and default value of each configuration item are as follows:
+```toml
+# The "plugins.cri" table contains all of the server options.
+[plugins.cri]
+
+  # stream_server_address is the ip address streaming server is listening on.
+  stream_server_address = ""
+
+  # stream_server_port is the port streaming server is listening on.
+  stream_server_port = "10010"
+
+  # enable_selinux indicates to enable the selinux support.
+  enable_selinux = false
+
+  # sandbox_image is the image used by sandbox container.
+  sandbox_image = "gcr.io/google_containers/pause:3.1"
+
+  # stats_collect_period is the period (in seconds) of snapshots stats collection.
+  stats_collect_period = 10
+
+  # systemd_cgroup enables systemd cgroup support.
+  systemd_cgroup = false
+
+  # "plugins.cri.containerd" contains config related to containerd
+  [plugins.cri.containerd]
+
+    # snapshotter is the snapshotter used by containerd.
+    snapshotter = "overlayfs"
+
+    # "plugins.cri.containerd.default_runtime" is the runtime to use in containerd.
+    [plugins.cri.containerd.default_runtime]
+      # runtime_type is the runtime type to use in containerd e.g. io.containerd.runtime.v1.linux
+      runtime_type = "io.containerd.runtime.v1.linux"
+
+      # runtime_engine is the name of the runtime engine used by containerd.
+      runtime_engine = ""
+
+      # runtime_root is the directory used by containerd for runtime state.
+      runtime_root = ""
+
+    # "plugins.cri.containerd.untrusted_workload_runtime" is a runtime to run untrusted workloads on it.
+    [plugins.cri.containerd.untrusted_workload_runtime]
+      # runtime_type is the runtime type to use in containerd e.g. io.containerd.runtime.v1.linux
+      runtime_type = ""
+
+      # runtime_engine is the name of the runtime engine used by containerd.
+      runtime_engine = ""
+
+      # runtime_root is the directory used by containerd for runtime state.
+      runtime_root = ""
+
+  # "plugins.cri.cni" contains config related to cni
+  [plugins.cri.cni]
+    # bin_dir is the directory in which the binaries for the plugin is kept.
+    bin_dir = "/opt/cni/bin"
+
+    # conf_dir is the directory in which the admin places a CNI conf.
+    conf_dir = "/etc/cni/net.d"
+
+  # "plugins.cri.registry" contains config related to the registry
+  [plugins.cri.registry]
+
+    # "plugins.cri.registry.mirrors" are namespace to mirror mapping for all namespaces.
+    [plugins.cri.registry.mirrors]
+      [plugins.cri.registry.mirrors."docker.io"]
+        endpoint = ["https://registry-1.docker.io", ]
+```