note-linux-redhat7

  1. rpm
  • system locale & keyboard
  • Date & Time
  • security
    1. Firewall
    2. Zone , Service
  • filesystem
    1. ACL
  • PAM
  • Email
  • rpm

    http://rpm-guide.readthedocs.io/en/latest/

    system locale & keyboard

    /etc/locale.conf
    localectl status/list-locales/

    Date & Time

    RTC , A real-time clock , hardware clock
    System clock , known as a software clock, that is maintained by the kernel and its initial
    value is based on the real-time clock. Once the system is booted and the system clock is
    initialized, the system clock is completely independent of the real-time clock.

    timedatectl , hwclock , date .

    security

    Firewall

    Zone , Service

    separate different net into different zones.

    ##

    filesystem

    /usr/share , /usr/lib ,

    ACL

    PAM

    Pluggable Authentication Modules

    Email

    client—myServer——-yourServer—-yourClient
    SMTP , POP/IMAP
    SMTP used for transfer from client to server and server 2 server .
    POP/IMAP used for retrieve email from mail server .

    • Mail Transport Agent
    • Mail Delivery Agent
    • Mail User Agent is synonymous with an email client application

    --Write by Marcustar,关关雎鸠,在河之洲
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