Enterprise Linux ver 7 notes:

Title:Enterprise Linux ver 7 notes:
Author:Douglas O’Leary <dkoleary@olearycomputers.com>
Description:EL7 research notes. Prob broken out later to different docs
Date created:12/14/17
Date updated:12/16/17
Disclaimer:Standard: Use the information that follows at your own risk. If you screw up a system, don’t blame it on me...

To-dos:

Questions:

  • (done) /etc/fstab: All filesystems default to 0 0 for dump and pass number? Haven’t seen it stated anywhere, but xfs doesn’t use fsck to check/validate journal log; rather it performs journal recovery in kernel space at mount time

Minimal install extras:

bind-utils
bc
elinks
git
lftp
perl (??)
policycoreutils-python
'virtual host'
virt-viewer
vsftpd.x86_64
xauth
nm-connection-editor
firewall-config
tcpdump
wget

Virtualization:

Notes in EL7 kvm/virtualization:

Research:

Issues:

  • (fixed) ssh-keygen -lf shows different key fingerprint:

    # ssh-keygen -lf ./a
    1024 SHA256:+Jl4PELjHQi8cIVqTB5hS6mIBE35SEGKSxDOQpc/YIQ dkoleary@localhost (DSA)
    

    Add -E md5 to cli:

    # ssh-keygen -E md5 -lf ./a
    1024 MD5:c2:dc:f6:dc:29:2a:86:24:f4:6c:c5:d0:61:90:a5:f3 dkoleary@localhost (DSA)
    
  • (fixd) X11 forwarding wasn’t working, reporting X11 forwarding failed on channel 0. Corrected by installing xauth. yum -y install xautth

  • (fixed) ftp not available to vm guests. Fixed via firewall-cmd --add-service=ftp.