knife ssh¶
Use the knife ssh
subcommand to invoke SSH commands (in parallel) on a subset of nodes within an organization, based on the results of a search query made to the Chef server.
Options¶
Note
Review the list of common options available to this (and all) knife subcommands and plugins.
This subcommand has the following options:
-a SSH_ATTR
,--attribute SSH_ATTR
- The attribute used when opening an SSH connection. The default attribute is the FQDN of the host. Other possible values include a public IP address, a private IP address, or a hostname.
-A
,--forward-agent
- Enable SSH agent forwarding.
-C NUM
,--concurrency NUM
- The number of allowed concurrent connections.
-e
,--exit-on-error
- Use to exit immediately upon error.
-G GATEWAY
,--ssh-gateway GATEWAY
- The SSH tunnel or gateway that is used to run a bootstrap action on a machine that is not accessible from the workstation.
--ssh-gateway-identity SSH_GATEWAY_IDENTITY
The SSH identity file used to connect to the SSH gateway.
New in Chef Client 13.0.
-i IDENTITY_FILE
,--identity-file IDENTIFY_FILE
- The SSH identity file used for authentication. Key-based authentication is recommended.
-m
,--manual-list
- Define a search query as a space-separated list of servers. If there is more than one item in the list, put quotes around the entire list. For example:
--manual-list "server01 server02 server03"
--[no-]host-key-verify
- Use
--no-host-key-verify
to disable host key verification. Default setting:--host-key-verify
. OTHER
- The shell type. Possible values:
interactive
,screen
,tmux
,macterm
, orcssh
. (csshx
is deprecated in favor ofcssh
.) -p PORT
,--ssh-port PORT
- The SSH port.
-P PASSWORD
,--ssh-password PASSWORD
- The SSH password. This can be used to pass the password directly on the command line. If this option is not specified (and a password is required) knife prompts for the password.
SEARCH_QUERY
- The search query used to return a list of servers to be accessed using SSH and the specified
SSH_COMMAND
. This option uses the same syntax as the search subcommand. If theSEARCH_QUERY
does not contain a colon character (:
), then the default query pattern istags:*#{@query}* OR roles:*#{@query}* OR fqdn:*#{@query}* OR addresses:*#{@query}*
, which means the following two search queries are effectively the same:
$ knife search ubuntu
or:
$ knife search node "tags:*ubuntu* OR roles:*ubuntu* OR fqdn:*ubuntu* (etc.)"
SSH_COMMAND
- The command to be run against the results of a search query.
-t SECONDS
,--ssh-timeout SECONDS
- The amount of time (in seconds) to wait for an SSH connection time out.
--tmux-split
- Split the Tmux window. Default value:
false
. -x USER_NAME
,--ssh-user USER_NAME
- The SSH user name.
Note
See config.rb for more information about how to add certain knife options as settings in the config.rb file.
Examples¶
The following examples show how to use this knife subcommand:
Find server uptime
To find the uptime of all of web servers running Ubuntu on the Amazon EC2 platform, enter:
$ knife ssh "role:web" "uptime" -x ubuntu -a ec2.public_hostname
to return something like:
ec2-174-129-127-206.compute-1.amazonaws.com 13:50:47 up 1 day, 23:26, 1 user, load average: 0.25, 0.18, 0.11
ec2-67-202-63-102.compute-1.amazonaws.com 13:50:47 up 1 day, 23:33, 1 user, load average: 0.12, 0.13, 0.10
ec2-184-73-9-250.compute-1.amazonaws.com 13:50:48 up 16:45, 1 user, load average: 0.30, 0.22, 0.13
ec2-75-101-240-230.compute-1.amazonaws.com 13:50:48 up 1 day, 22:59, 1 user, load average: 0.24, 0.17, 0.11
ec2-184-73-60-141.compute-1.amazonaws.com 13:50:48 up 1 day, 23:30, 1 user, load average: 0.32, 0.17, 0.15
Run the chef-client on all nodes
$ knife ssh 'name:*' 'sudo chef-client'
Force a chef-client run
To force a chef-client run on all of the web servers running Ubuntu on the Amazon EC2 platform, enter:
$ knife ssh "role:web" "sudo chef-client" -x ubuntu -a ec2.public_hostname
to return something like:
ec2-67-202-63-102.compute-1.amazonaws.com [Fri, 22 Oct 2010 14:18:37 +0000] INFO: Starting Chef Run (Version 0.9.10)
ec2-174-129-127-206.compute-1.amazonaws.com [Fri, 22 Oct 2010 14:18:37 +0000] INFO: Starting Chef Run (Version 0.9.10)
ec2-184-73-9-250.compute-1.amazonaws.com [Fri, 22 Oct 2010 14:18:38 +0000] INFO: Starting Chef Run (Version 0.9.10)
ec2-75-101-240-230.compute-1.amazonaws.com [Fri, 22 Oct 2010 14:18:38 +0000] INFO: Starting Chef Run (Version 0.9.10)
ec2-184-73-60-141.compute-1.amazonaws.com [Fri, 22 Oct 2010 14:18:38 +0000] INFO: Starting Chef Run (Version 0.9.10)
ec2-174-129-127-206.compute-1.amazonaws.com [Fri, 22 Oct 2010 14:18:39 +0000] INFO: Chef Run complete in 1.419243 seconds
ec2-174-129-127-206.compute-1.amazonaws.com [Fri, 22 Oct 2010 14:18:39 +0000] INFO: cleaning the checksum cache
ec2-174-129-127-206.compute-1.amazonaws.com [Fri, 22 Oct 2010 14:18:39 +0000] INFO: Running report handlers
ec2-174-129-127-206.compute-1.amazonaws.com [Fri, 22 Oct 2010 14:18:39 +0000] INFO: Report handlers complete
ec2-67-202-63-102.compute-1.amazonaws.com [Fri, 22 Oct 2010 14:18:39 +0000] INFO: Chef Run complete in 1.578265 seconds
ec2-67-202-63-102.compute-1.amazonaws.com [Fri, 22 Oct 2010 14:18:39 +0000] INFO: cleaning the checksum cache
ec2-67-202-63-102.compute-1.amazonaws.com [Fri, 22 Oct 2010 14:18:39 +0000] INFO: Running report handlers
ec2-67-202-63-102.compute-1.amazonaws.com [Fri, 22 Oct 2010 14:18:39 +0000] INFO: Report handlers complete
ec2-184-73-9-250.compute-1.amazonaws.com [Fri, 22 Oct 2010 14:18:40 +0000] INFO: Chef Run complete in 1.638884 seconds
ec2-184-73-9-250.compute-1.amazonaws.com [Fri, 22 Oct 2010 14:18:40 +0000] INFO: cleaning the checksum cache
ec2-184-73-9-250.compute-1.amazonaws.com [Fri, 22 Oct 2010 14:18:40 +0000] INFO: Running report handlers
ec2-184-73-9-250.compute-1.amazonaws.com [Fri, 22 Oct 2010 14:18:40 +0000] INFO: Report handlers complete
ec2-75-101-240-230.compute-1.amazonaws.com [Fri, 22 Oct 2010 14:18:40 +0000] INFO: Chef Run complete in 1.540257 seconds
ec2-75-101-240-230.compute-1.amazonaws.com [Fri, 22 Oct 2010 14:18:40 +0000] INFO: cleaning the checksum cache
ec2-75-101-240-230.compute-1.amazonaws.com [Fri, 22 Oct 2010 14:18:40 +0000] INFO: Running report handlers
ec2-75-101-240-230.compute-1.amazonaws.com [Fri, 22 Oct 2010 14:18:40 +0000] INFO: Report handlers complete
ec2-184-73-60-141.compute-1.amazonaws.com [Fri, 22 Oct 2010 14:18:40 +0000] INFO: Chef Run complete in 1.502489 seconds
ec2-184-73-60-141.compute-1.amazonaws.com [Fri, 22 Oct 2010 14:18:40 +0000] INFO: cleaning the checksum cache
ec2-184-73-60-141.compute-1.amazonaws.com [Fri, 22 Oct 2010 14:18:40 +0000] INFO: Running report handlers
ec2-184-73-60-141.compute-1.amazonaws.com [Fri, 22 Oct 2010 14:18:40 +0000] INFO: Report handlers complete
Run a command based on search query
To query for all nodes that have the webserver
role and then use SSH to run the command sudo chef-client
, enter:
$ knife ssh "role:webserver" "sudo chef-client"
Upgrade all nodes
$ knife ssh name:* "sudo aptitude upgrade -y"
Specify the shell type
To specify the shell type used on the nodes returned by a search query:
$ knife ssh roles:opscode-omnitruck macterm
where screen
is one of the following values: cssh
, interactive
, macterm
, screen
, or tmux
. If the node does not have the shell type installed, knife will return an error similar to the following:
you need the rb-appscript gem to use knife ssh macterm.
`(sudo) gem install rb-appscript` to install
ERROR: LoadError: cannot load such file -- appscript