NAME¶

kubectl logs - Print the logs for a container in a pod

SYNOPSIS¶

kubectl logs [OPTIONS]

DESCRIPTION¶

Print the logs for a container in a pod or specified resource. If the pod has only one container, the container name is optional.

OPTIONS¶

--all-containers=false Get all containers' logs in the pod(s).

-c, --container="" Print the logs of this container

-f, --follow=false Specify if the logs should be streamed.

--ignore-errors=false If watching / following pod logs, allow for any errors that occur to be non-fatal

--insecure-skip-tls-verify-backend=false Skip verifying the identity of the kubelet that logs are requested from. In theory, an attacker could provide invalid log content back. You might want to use this if your kubelet serving certificates have expired.

--limit-bytes=0 Maximum bytes of logs to return. Defaults to no limit.

--max-log-requests=5 Specify maximum number of concurrent logs to follow when using by a selector. Defaults to 5.

--pod-running-timeout=20s The length of time (like 5s, 2m, or 3h, higher than zero) to wait until at least one pod is running

--prefix=false Prefix each log line with the log source (pod name and container name)

-p, --previous=false If true, print the logs for the previous instance of the container in a pod if it exists.

-l, --selector="" Selector (label query) to filter on.

--since=0s Only return logs newer than a relative duration like 5s, 2m, or 3h. Defaults to all logs. Only one of since-time / since may be used.

--since-time="" Only return logs after a specific date (RFC3339). Defaults to all logs. Only one of since-time / since may be used.

--tail=-1 Lines of recent log file to display. Defaults to -1 with no selector, showing all log lines otherwise 10, if a selector is provided.

--timestamps=false Include timestamps on each line in the log output

OPTIONS INHERITED FROM PARENT COMMANDS¶

--add-dir-header=false If true, adds the file directory to the header of the log messages

--alsologtostderr=false log to standard error as well as files

--application-metrics-count-limit=100 Max number of application metrics to store (per container)

--as="" Username to impersonate for the operation

--as-group=[] Group to impersonate for the operation, this flag can be repeated to specify multiple groups.

--azure-container-registry-config="" Path to the file containing Azure container registry configuration information.

--boot-id-file="/proc/sys/kernel/random/boot_id" Comma-separated list of files to check for boot-id. Use the first one that exists.

--cache-dir="/home/user/.kube/cache" Default cache directory

--certificate-authority="" Path to a cert file for the certificate authority

--client-certificate="" Path to a client certificate file for TLS

--client-key="" Path to a client key file for TLS

--cloud-provider-gce-l7lb-src-cidrs=130.211.0.0/22,35.191.0.0/16 CIDRs opened in GCE firewall for L7 LB traffic proxy health checks

--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 CIDRs opened in GCE firewall for L4 LB traffic proxy health checks

--cluster="" The name of the kubeconfig cluster to use

--container-hints="/etc/cadvisor/container_hints.json" location of the container hints file

--containerd="/run/containerd/containerd.sock" containerd endpoint

--containerd-namespace="k8s.io" containerd namespace

--context="" The name of the kubeconfig context to use

--default-not-ready-toleration-seconds=300 Indicates the tolerationSeconds of the toleration for notReady:NoExecute that is added by default to every pod that does not already have such a toleration.

--default-unreachable-toleration-seconds=300 Indicates the tolerationSeconds of the toleration for unreachable:NoExecute that is added by default to every pod that does not already have such a toleration.

--disable-root-cgroup-stats=false Disable collecting root Cgroup stats

--docker="unix:///var/run/docker.sock" docker endpoint

--docker-env-metadata-whitelist="" a comma-separated list of environment variable keys matched with specified prefix that needs to be collected for docker containers

--docker-only=false Only report docker containers in addition to root stats

--docker-root="/var/lib/docker" DEPRECATED: docker root is read from docker info (this is a fallback, default: /var/lib/docker)

--docker-tls=false use TLS to connect to docker

--docker-tls-ca="ca.pem" path to trusted CA

--docker-tls-cert="cert.pem" path to client certificate

--docker-tls-key="key.pem" path to private key

--enable-load-reader=false Whether to enable cpu load reader

--event-storage-age-limit="default=0" Max length of time for which to store events (per type). Value is a comma separated list of key values, where the keys are event types (e.g.: creation, oom) or "default" and the value is a duration. Default is applied to all non-specified event types

--event-storage-event-limit="default=0" Max number of events to store (per type). Value is a comma separated list of key values, where the keys are event types (e.g.: creation, oom) or "default" and the value is an integer. Default is applied to all non-specified event types

--global-housekeeping-interval=1m0s Interval between global housekeepings

--housekeeping-interval=10s Interval between container housekeepings

--insecure-skip-tls-verify=false If true, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure

--kubeconfig="" Path to the kubeconfig file to use for CLI requests.

--log-backtrace-at=:0 when logging hits line file:N, emit a stack trace

--log-cadvisor-usage=false Whether to log the usage of the cAdvisor container

--log-dir="" If non-empty, write log files in this directory

--log-file="" If non-empty, use this log file

--log-file-max-size=1800 Defines the maximum size a log file can grow to. Unit is megabytes. If the value is 0, the maximum file size is unlimited.

--log-flush-frequency=5s Maximum number of seconds between log flushes

--logtostderr=true log to standard error instead of files

--machine-id-file="/etc/machine-id,/var/lib/dbus/machine-id" Comma-separated list of files to check for machine-id. Use the first one that exists.

--match-server-version=false Require server version to match client version

-n, --namespace="" If present, the namespace scope for this CLI request

--one-output=false If true, only write logs to their native severity level (vs also writing to each lower severity level

--password="" Password for basic authentication to the API server

--profile="none" Name of profile to capture. One of (none|cpu|heap|goroutine|threadcreate|block|mutex)

--profile-output="profile.pprof" Name of the file to write the profile to

--referenced-reset-interval=0 Reset interval for referenced bytes (container_referenced_bytes metric), number of measurement cycles after which referenced bytes are cleared, if set to 0 referenced bytes are never cleared (default: 0)

--request-timeout="0" The length of time to wait before giving up on a single server request. Non-zero values should contain a corresponding time unit (e.g. 1s, 2m, 3h). A value of zero means don't timeout requests.

-s, --server="" The address and port of the Kubernetes API server

--skip-headers=false If true, avoid header prefixes in the log messages

--skip-log-headers=false If true, avoid headers when opening log files

--stderrthreshold=2 logs at or above this threshold go to stderr

--storage-driver-buffer-duration=1m0s Writes in the storage driver will be buffered for this duration, and committed to the non memory backends as a single transaction

--storage-driver-db="cadvisor" database name

--storage-driver-host="localhost:8086" database host:port

--storage-driver-password="root" database password

--storage-driver-secure=false use secure connection with database

--storage-driver-table="stats" table name

--storage-driver-user="root" database username

--tls-server-name="" Server name to use for server certificate validation. If it is not provided, the hostname used to contact the server is used

--token="" Bearer token for authentication to the API server

--update-machine-info-interval=5m0s Interval between machine info updates.

--user="" The name of the kubeconfig user to use

--username="" Username for basic authentication to the API server

-v, --v=0 number for the log level verbosity

--version=false Print version information and quit

--vmodule= comma-separated list of pattern=N settings for file-filtered logging

--warnings-as-errors=false Treat warnings received from the server as errors and exit with a non-zero exit code

EXAMPLE¶

  # Return snapshot logs from pod nginx with only one container


  kubectl logs nginx


  


  # Return snapshot logs from pod nginx with multi containers


  kubectl logs nginx --all-containers=true


  


  # Return snapshot logs from all containers in pods defined by label app=nginx


  kubectl logs -lapp=nginx --all-containers=true


  


  # Return snapshot of previous terminated ruby container logs from pod web-1


  kubectl logs -p -c ruby web-1


  


  # Begin streaming the logs of the ruby container in pod web-1


  kubectl logs -f -c ruby web-1


  


  # Begin streaming the logs from all containers in pods defined by label app=nginx


  kubectl logs -f -lapp=nginx --all-containers=true


  


  # Display only the most recent 20 lines of output in pod nginx


  kubectl logs --tail=20 nginx


  


  # Show all logs from pod nginx written in the last hour


  kubectl logs --since=1h nginx


  


  # Show logs from a kubelet with an expired serving certificate


  kubectl logs --insecure-skip-tls-verify-backend nginx


  


  # Return snapshot logs from first container of a job named hello


  kubectl logs job/hello


  


  # Return snapshot logs from container nginx-1 of a deployment named nginx


  kubectl logs deployment/nginx -c nginx-1

SEE ALSO¶

kubectl(1),

HISTORY¶

January 2015, Originally compiled by Eric Paris (eparis at redhat dot com) based on the kubernetes source material, but hopefully they have been automatically generated since!