kubectl logs

Synopsis

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

  1. kubectl logs [-f] [-p] (POD | TYPE/NAME) [-c CONTAINER]

Examples

  1.   # Return snapshot logs from pod nginx with only one container
  2.   kubectl logs nginx
  4.   # Return snapshot logs from pod nginx with multi containers
  5.   kubectl logs nginx --all-containers=true
  7.   # Return snapshot logs from all containers in pods defined by label app=nginx
  8.   kubectl logs -l app=nginx --all-containers=true
  10.   # Return snapshot of previous terminated ruby container logs from pod web-1
  11.   kubectl logs -p -c ruby web-1
  13.   # Begin streaming the logs of the ruby container in pod web-1
  14.   kubectl logs -f -c ruby web-1
  16.   # Begin streaming the logs from all containers in pods defined by label app=nginx
  17.   kubectl logs -f -l app=nginx --all-containers=true
  19.   # Display only the most recent 20 lines of output in pod nginx
  20.   kubectl logs --tail=20 nginx
  22.   # Show all logs from pod nginx written in the last hour
  23.   kubectl logs --since=1h nginx
  25.   # Show logs from a kubelet with an expired serving certificate
  26.   kubectl logs --insecure-skip-tls-verify-backend nginx
  28.   # Return snapshot logs from first container of a job named hello
  29.   kubectl logs job/hello
  31.   # Return snapshot logs from container nginx-1 of a deployment named nginx
  32.   kubectl logs deployment/nginx -c nginx-1

Options

—all-containers

Get all containers’ logs in the pod(s).

-c, —container string

Print the logs of this container

-f, —follow

Specify if the logs should be streamed.

-h, —help

help for logs

—ignore-errors

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

—insecure-skip-tls-verify-backend

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 int

Maximum bytes of logs to return. Defaults to no limit.

—max-log-requests int     Default: 5

Specify maximum number of concurrent logs to follow when using by a selector. Defaults to 5.

—pod-running-timeout duration     Default: 20s

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

—prefix

Prefix each log line with the log source (pod name and container name)

-p, —previous

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

-l, —selector string

Selector (label query) to filter on, supports ‘=’, ‘==’, and ‘!=’.(e.g. -l key1=value1,key2=value2). Matching objects must satisfy all of the specified label constraints.

—since duration

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 string

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

—tail int     Default: -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

Include timestamps on each line in the log output

—as string

Username to impersonate for the operation. User could be a regular user or a service account in a namespace.

—as-group strings

Group to impersonate for the operation, this flag can be repeated to specify multiple groups.

—as-uid string

UID to impersonate for the operation.

—cache-dir string     Default: “$HOME/.kube/cache”

Default cache directory

—certificate-authority string

Path to a cert file for the certificate authority

—client-certificate string

Path to a client certificate file for TLS

—client-key string

Path to a client key file for TLS

—cloud-provider-gce-l7lb-src-cidrs cidrs     Default: 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 cidrs     Default: 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 string

The name of the kubeconfig cluster to use

—context string

The name of the kubeconfig context to use

—default-not-ready-toleration-seconds int     Default: 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 int     Default: 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-compression

If true, opt-out of response compression for all requests to the server

—insecure-skip-tls-verify

If true, the server’s certificate will not be checked for validity. This will make your HTTPS connections insecure

—kubeconfig string

Path to the kubeconfig file to use for CLI requests.

—match-server-version

Require server version to match client version

-n, —namespace string

If present, the namespace scope for this CLI request

—password string

Password for basic authentication to the API server

—profile string     Default: “none”

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

—profile-output string     Default: “profile.pprof”

Name of the file to write the profile to

—request-timeout string     Default: “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 string

The address and port of the Kubernetes API server

—storage-driver-buffer-duration duration     Default: 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 string     Default: “cadvisor”

database name

—storage-driver-host string     Default: “localhost:8086”

database host:port

—storage-driver-password string     Default: “root”

database password

—storage-driver-secure

use secure connection with database

—storage-driver-table string     Default: “stats”

table name

—storage-driver-user string     Default: “root”

database username

—tls-server-name string

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

—token string

Bearer token for authentication to the API server

—user string

The name of the kubeconfig user to use

—username string

Username for basic authentication to the API server

—version version[=true]

—version, —version=raw prints version information and quits; —version=vX.Y.Z… sets the reported version

—warnings-as-errors

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

See Also

  • kubectl - kubectl controls the Kubernetes cluster manager