82 lines
2.4 KiB
Markdown
82 lines
2.4 KiB
Markdown
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The cluster utilities are script allowing to work in parallel with a
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number of remote hosts, using utilities such as Parallel SSH (pssh) or
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fping. They all take as first and mandatory positional argument a host
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list name “NAME”; the list will be searched according to the following
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pattern:
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$XDG_CONFIG_HOME/cluster/NAME.lst
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(`$XDG_CONFIG_HOME` being equivalent to `$HOME/.config` if unset.)
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For example, one can call the `cluster-ping.sh` script typing:
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cluster-ping my_hosts
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to use the hosts' file `$XDG_CONFIG_HOME/cluster/my_hosts.lst`.
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The format of such a .lst file is one line per host name or IP address,
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for example:
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```
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192.168.42.1
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192.168.42.3
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priam
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```
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The scripts based on SSH use the local user's login name as remote login;
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this can be changed using the `-l` option, that must appear before the
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hosts list on the command line, for example:
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cluster-run -l root openwrt_machines opkg install screen
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The provided scripts are detailed in the sequel.
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cluster-ping.sh
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---------------
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Test the connectivity with the hosts of the list by sending them a ICMP
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echo packet.
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**Dependency**: `fping`
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cluster-ssh.sh
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--------------
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Open a GNU Screen tab with an interactive SSH session for each host of
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the hosts list. Must be run inside of an existing Screen.
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**Dependencies**: `screen`, `ssh`
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cluster-run.sh
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--------------
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Run the same command on every host of the hosts list.
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**Dependency**: `parallel-ssh` (`pssh`)
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cluster-deploy.sh
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-----------------
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Deploy one or more files in parallel on every host of the hosts list.
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The files are copied in the remote user's home directory.
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By default, the files are transferred one by one, to make sure you notice
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the errors for each file (bad permissions, out of space, etc.), but you
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can use the `-P` switch to transfer them all at once (faster).
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While it is possible to transfer directories with the default option, to
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synchronise directories one would rather use the `-r` option, that uses
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prsync rather than pscp to transfer the files. With the `-R` option, the
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remote files that are not in the local copy will be deleted (rsync's
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`--delete` option). In both cases, the transfer is done with rsync's `-a`
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(archive) option.
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Please note that unlike rsync, prsync cannot handle multiple local files,
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therefore the `-P` option is ignored when passed along with `-r` or `-R`.
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**Dependencies**: `parallel-scp` (`pscp`), `parallel-rsync` (`prsync`),
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`cluster-ping` (see above)
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