1OC ADM(1) June 2016 OC ADM(1)
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6 oc adm drain - Drain node in preparation for maintenance
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11 oc adm drain [OPTIONS]
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16 Drain node in preparation for maintenance.
17 The given node will be marked unschedulable to prevent new pods from
20 arriving. 'drain' evicts the pods if the APIServer supports eviction (
21 ⟨http://kubernetes.io/docs/admin/disruptions/⟩). Otherwise, it will use
22 normal DELETE to delete the pods. The 'drain' evicts or deletes all
23 pods except mirror pods (which cannot be deleted through the API
24 server). If there are DaemonSet-managed pods, drain will not proceed
25 without --ignore-daemonsets, and regardless it will not delete any Dae‐
26 monSet-managed pods, because those pods would be immediately replaced
27 by the DaemonSet controller, which ignores unschedulable markings. If
28 there are any pods that are neither mirror pods nor managed by Replica‐
29 tionController, ReplicaSet, DaemonSet, StatefulSet or Job, then drain
30 will not delete any pods unless you use --force. --force will also
31 allow deletion to proceed if the managing resource of one or more pods
32 is missing.
33 When you are ready to put the node back into service, use kubectl
36 uncordon, which will make the node schedulable again.
37 ! ⟨http://kubernetes.io/images/docs/kubectl_drain.svg⟩
40
44 --delete-local-data=false
45 Continue even if there are pods using emptyDir (local data that
46 will be deleted when the node is drained).
47 --dry-run=false
50 If true, only print the object that would be sent, without sending
51 it.
52 --force=false
55 Continue even if there are pods not managed by a ReplicationCon‐
56 troller, ReplicaSet, Job, DaemonSet or StatefulSet.
57 --grace-period=-1
60 Period of time in seconds given to each pod to terminate grace‐
61 fully. If negative, the default value specified in the pod will be
62 used.
63 --ignore-daemonsets=false
66 Ignore DaemonSet-managed pods.
67 --pod-selector=""
70 Label selector to filter pods on the node
71 -l, --selector=""
74 Selector (label query) to filter on
75 --timeout=0
78 The length of time to wait before giving up, zero means infinite
79
83 --allow_verification_with_non_compliant_keys=false
84 Allow a SignatureVerifier to use keys which are technically
85 non-compliant with RFC6962.
86 --alsologtostderr=false
89 log to standard error as well as files
90 --application_metrics_count_limit=100
93 Max number of application metrics to store (per container)
94 --as=""
97 Username to impersonate for the operation
98 --as-group=[]
101 Group to impersonate for the operation, this flag can be repeated
102 to specify multiple groups.
103 --azure-container-registry-config=""
106 Path to the file containing Azure container registry configuration
107 information.
108 --boot_id_file="/proc/sys/kernel/random/boot_id"
111 Comma-separated list of files to check for boot-id. Use the first
112 one that exists.
113 --cache-dir="/builddir/.kube/http-cache"
116 Default HTTP cache directory
117 --certificate-authority=""
120 Path to a cert file for the certificate authority
121 --client-certificate=""
124 Path to a client certificate file for TLS
125 --client-key=""
128 Path to a client key file for TLS
129 --cloud-provider-gce-lb-src-cidrs=130.211.0.0/22,209.85.152.0/22,209.85.204.0/22,35.191.0.0/16
132 CIDRs opened in GCE firewall for LB traffic proxy health checks
133 --cluster=""
136 The name of the kubeconfig cluster to use
137 --container_hints="/etc/cadvisor/container_hints.json"
140 location of the container hints file
141 --containerd="unix:///var/run/containerd.sock"
144 containerd endpoint
145 --context=""
148 The name of the kubeconfig context to use
149 --default-not-ready-toleration-seconds=300
152 Indicates the tolerationSeconds of the toleration for
153 notReady:NoExecute that is added by default to every pod that does not
154 already have such a toleration.
155 --default-unreachable-toleration-seconds=300
158 Indicates the tolerationSeconds of the toleration for unreach‐
159 able:NoExecute that is added by default to every pod that does not
160 already have such a toleration.
161 --docker="unix:///var/run/docker.sock"
164 docker endpoint
165 --docker-tls=false
168 use TLS to connect to docker
169 --docker-tls-ca="ca.pem"
172 path to trusted CA
173 --docker-tls-cert="cert.pem"
176 path to client certificate
177 --docker-tls-key="key.pem"
180 path to private key
181 --docker_env_metadata_whitelist=""
184 a comma-separated list of environment variable keys that needs to
185 be collected for docker containers
186 --docker_only=false
189 Only report docker containers in addition to root stats
190 --docker_root="/var/lib/docker"
193 DEPRECATED: docker root is read from docker info (this is a fall‐
194 back, default: /var/lib/docker)
195 --enable_load_reader=false
198 Whether to enable cpu load reader
199 --event_storage_age_limit="default=24h"
202 Max length of time for which to store events (per type). Value is a
203 comma separated list of key values, where the keys are event types
204 (e.g.: creation, oom) or "default" and the value is a duration. Default
205 is applied to all non-specified event types
206 --event_storage_event_limit="default=100000"
209 Max number of events to store (per type). Value is a comma sepa‐
210 rated list of key values, where the keys are event types (e.g.: cre‐
211 ation, oom) or "default" and the value is an integer. Default is
212 applied to all non-specified event types
213 --global_housekeeping_interval=0
216 Interval between global housekeepings
217 --housekeeping_interval=0
220 Interval between container housekeepings
221 --insecure-skip-tls-verify=false
224 If true, the server's certificate will not be checked for validity.
225 This will make your HTTPS connections insecure
226 --kubeconfig=""
229 Path to the kubeconfig file to use for CLI requests.
230 --log-flush-frequency=0
233 Maximum number of seconds between log flushes
234 --log_backtrace_at=:0
237 when logging hits line file:N, emit a stack trace
238 --log_cadvisor_usage=false
241 Whether to log the usage of the cAdvisor container
242 --log_dir=""
245 If non-empty, write log files in this directory
246 --logtostderr=true
249 log to standard error instead of files
250 --machine_id_file="/etc/machine-id,/var/lib/dbus/machine-id"
253 Comma-separated list of files to check for machine-id. Use the
254 first one that exists.
255 --match-server-version=false
258 Require server version to match client version
259 -n, --namespace=""
262 If present, the namespace scope for this CLI request
263 --request-timeout="0"
266 The length of time to wait before giving up on a single server
267 request. Non-zero values should contain a corresponding time unit (e.g.
268 1s, 2m, 3h). A value of zero means don't timeout requests.
269 -s, --server=""
272 The address and port of the Kubernetes API server
273 --stderrthreshold=2
276 logs at or above this threshold go to stderr
277 --storage_driver_buffer_duration=0
280 Writes in the storage driver will be buffered for this duration,
281 and committed to the non memory backends as a single transaction
282 --storage_driver_db="cadvisor"
285 database name
286 --storage_driver_host="localhost:8086"
289 database host:port
290 --storage_driver_password="root"
293 database password
294 --storage_driver_secure=false
297 use secure connection with database
298 --storage_driver_table="stats"
301 table name
302 --storage_driver_user="root"
305 database username
306 --token=""
309 Bearer token for authentication to the API server
310 --user=""
313 The name of the kubeconfig user to use
314 -v, --v=0
317 log level for V logs
318 --version=false
321 Print version information and quit
322 --vmodule=
325 comma-separated list of pattern=N settings for file-filtered log‐
326 ging
327
331 # Drain node "foo", even if there are pods not managed by a ReplicationController, ReplicaSet, Job, DaemonSet or StatefulSet on it.
332 $ oc adm drain foo --force
333 # As above, but abort if there are pods not managed by a ReplicationController, ReplicaSet, Job, DaemonSet or StatefulSet, and use a grace period of 15 minutes.
335 $ oc adm drain foo --grace-period=900
336
341 oc-adm(1),
342
346 June 2016, Ported from the Kubernetes man-doc generator
347Openshift Openshift CLI User Manuals OC ADM(1)
