error message –
root@host:~# swapon /swap-file-00
swapon: /swap-file-00: skipping - it appears to have holes.Category: Sysadmin
the stuff which can be used on most linux distributions irrespective of their allegiance to a certain package manager: storage, packages, security.
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swap file appears to have holes
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list all versions of an available package using yum/dnf
dnf list <packagename> --showduplicates
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autofs mounts
autofs is a nice traditional way to mount the nfs directories on-demand on the nfs clients. was originally used to mount the user home directories to the clients to make them sort of roaming user profiles, but this doesnt stop us from using it to configure nfs mounts in other ways. using autofs saves unnecessary resource allocation to mount the resources on a client machine, which may never be accessed in that session. it also saves the open handles on the nfs server, which is another plus.
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selinux prevents mounted directories for serving content for httpd
error message
(13)Permission denied: [client <ipaddress>:<port>] AH00035: access to /index.html denied (filesystem path '/opt/rh/httpd24/root/var/www/html/index.html') because search permissions are missing on a component of the path
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gpg2 – using the OpenPGP encryption and signing tool to encrypt and decrypt
most standard versions of linux distro’s come with the newer gpg2 command comes by default. the previous version of gpg is linked to the newer gpg2 packages. this means you may use the gpg and gpg2 command and it will always run the gpg2 command. an excerpt from a centos 7 below explains that
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