Method One: Check the MD5 code of the file
>certUtil -hashfile <file> MD5Or:
> Get-FileHash .\<file> -Algorithm MD5 | Format-ListMethod Two: Check the SHA256 code of the file
>certUtil -hashfile <file> SHA256No-cost subscription for open source world
Red Hat no cost subscription : Red Hat Developer Subscription for Individuals
The main function of this license is that can let we access Red Hat knowledge-based articles for individual development purpose
https://developers.redhat.com/products/rhel/download
[CONTENT] The network connections required for system register
Content:
RHEL:
| Domain | Port Number | Port protocol |
| subscription.rhsm.redhat.com | 443 | TCP |
| cdn.redhat.com | 443 | TCP |
SLES:
| Domain | Port Number | Port protocol |
| scc.suse.com | 80 or 443 | TCP |
| updates.suse.com | 80 or 443 | TCP |
| installer-updates.suse.com | 80 or 443 | TCP |
Reference:
https://access.redhat.com/solutions/65300
https://www.suse.com/support/kb/doc/?id=000021034#:~:text=%2A%20The%20current%20list%20of%20IPs,for%20scc.suse.com%20and%20registry.suse.com%20are%3A%2099.83.188.102
[DEBUG] Linux tmux new -s 1 ‘error creating /tmp/tmux-0 (Permission denied)’
Error Code:
# tmux new -s 1
error creating /tmp/tmux-0 (Permission denied)Solution:
# chown root:root /tmp/tmux-0[DEBUG] Linux resolve df command error ‘df: cannot read table of mounted file systems: Permission denied’
Error Code:
> df -h
df: cannot read table of mounted file systems: Permission deniedAnalysis:
If we are in this situation, after we use top command, we can see follow promotion
> top
Error, do this: mount -t proc proc /procSolution:
# mount -t proc proc /proc