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Sysadmin How do you manage multiple servers ?

Discussion in 'System Administration' started by GASTAN, Dec 16, 2018.

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  1. Dec 16, 2018 #1
    GASTAN

    GASTAN Member

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    @eva2000 what do u use to keep of track of zillions server you must have control over?
    for example, for my WordPress sites I use Sync from iThemes.
    it shows updates per server, I can do backups, and I can update all servers with 2 button clicks.
    Is there something like this?
     
    Last edited: Dec 16, 2018
  2. Dec 16, 2018 #2
    eva2000

    eva2000 Administrator Staff Member

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    Nginx 1.31.x
    MariaDB 10.x/11.4+/12.3+
    yum-cron Automatic nightly YUM updates with yum-cron + SecureCRT ssh client supports running single command to multiple ssh window sessions so I can update centmin mod servers 100s at a time with one command line to update 123.09beta01 = cmupdate and one single command set for running centmin.sh menu option 4/5 etc. For example, i can update centmin mod nginx on 100+ servers within 2-5 minutes with a single command line set.

    also centmin mod 123.09beta01 servers can be configured to auto update the code at least see Upgrade Centmin Mod - CentminMod.com LEMP Nginx web stack for CentOS - that is for 123.08stable. For 123.09beta01 just setup cronjob to run cmupdate command too.

    also 123.09beta01 has AUTO_GITUPDATE='n' option default, which when set to AUTO_GITUPDATE='y' can also auto update
    Code (Text):
    # With AUTO_GITUPDATE='y' if centmin mod code install 
# directory has been setup with git environment via 
# centmin.sh menu option 23 # submenu option 1, then 
# allow centmin.sh to auto update # the centmin mod 
# code at /usr/local/src/centminmod 
# silently in background
#
# if you want to retain local centmin mod code changes
# made to files in /usr/local/src/centminmod for variables
# in centmin.sh, use persistent config file you create
# or append to at /etc/centminmod/custom_config.inc as
# outlined on official site at 
# https://centminmod.com/upgrade.html#persistent
AUTO_GITUPDATE='n'
     
    Last edited: Dec 16, 2018
  3. Dec 16, 2018 #3
    eva2000

    eva2000 Administrator Staff Member

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    Nginx 1.31.x
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    example with SecureCRT with just 2 servers managed by single command line

    centminmod-securecrt-01.gif

    running cmupdate on both servers via single command

    centminmod-securecrt-02.gif
     
    Last edited: Dec 16, 2018
  4. Dec 16, 2018 #4
    GASTAN

    GASTAN Member

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    nice, thx.
    so it's considered safe to run yum autoupdate on prod sites?
    I guess from update email (if it comes) I can see if kernel was updated and I need to reboot

    running multiple CRT session is great idea!

    PS:
    Did I open new thread? I believe was in Cockpit thread (that's what reminded me I wanted to ask this for some time)
     
  5. Dec 16, 2018 #5
    eva2000

    eva2000 Administrator Staff Member

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    moved posts to own thread :)

    yes possibility of stuff breaking though with 100s of servers only a few had issues and it is usually with package conflicts which need to manually sort out - hence handy to use SecureCRT ssh sessions as you can see first hand the issues and send just that server's ssh window to a new ssh window by itself to focus on issues while rest of servers' ssh sessions are grouped together. SecureCRT makes it very easy for me to manage servers etc.
     
  6. Dec 16, 2018 #6
    eva2000

    eva2000 Administrator Staff Member

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    SecureCRT command options

    securecrt-send-commands.png
     
  7. Dec 23, 2018 #7
    GASTAN

    GASTAN Member

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    cool deal, thx.
    I ended up with MobaXterm free, since I just hobbying around and it is enough for now in free version
     
  8. Jan 17, 2019 #8
    Kintaro

    Kintaro Member

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    Who are on macOS can use iTerm2 (opensource).
    CMD+ALT+I activates the magic.
     
  9. Jan 18, 2019 #9
    buik

    buik “The best traveler is one without a camera.”

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    You could use puppet if you want to manage large amount of servers.
    How Puppet works
     
  10. Jan 18, 2019 #10
    eva2000

    eva2000 Administrator Staff Member

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    Yeah if you are more technically inclined, you can look into using ansible, chef or puppet. I usually prefer Ansible
     
  11. Jan 19, 2019 #11
    buik

    buik “The best traveler is one without a camera.”

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    For a few servers.
    Default SSH via the command line or Putty (Windows) does the job as it should be.
    There can't go much wrong, as long as there are fresh back-ups available.
     
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