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:

• virtualization

• firewall research:

  • enable ftp/nfs/etc for vms

  • Recreating my firewall script in firewall-cmd

• pulp

• puppet

• autofs mounting home dirs

• mv samba to vmsrv

• Research:

  • btrfs - better filesystem. Apparently, better than xfs.

  • el7 networking:

    • (done-ish) network node manager - fuck

    • (done) network commands

  • xfs filesystems:

    See https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/storage_administration_guide/ch-xfs

    • growing, shrinking, defrag, etc.

    • xfs_repair: (doesn’t run at boot which probably explains the 0 0 in /etc/fstab) See: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/storage_administration_guide/xfsrepair

  • selinux

• (done) Research

  • el7 networking:

    • (done-ish) network node manager - fuck

    • (done) network commands

• (done) ssh configuration

  • Updating sshd_config

  • Updated public keys

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:

Research:

URLs:

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/pdf/virtualization_deployment_and_administration_guide/Red_Hat_Enterprise_Linux-7-Virtualization_Deployment_and_Administration_Guide-en-US.pdf

EL7 virtualization guide.

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/storage_administration_guide/ch-xfs

XFS filesystem information

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.