BTK Apprendre et faire apprendre

   uname -r dnf update -y dnf upgrade  -y reboot

 Pour checker le nombre de connexion via le webmail   grep "Logged in" /var/log/maillog | grep "rip=::1" | awk -F'user=<' '{print $2}' | cut -d'>' -f1 | sort | uniq -c | sort -nr | head -n 10 Le nombre des IPs et ::1 siginife le webmail  grep "Logged in" /var/log/maillog | awk '{print $11}' | cut -d= -f2 | sort | uniq -c | sort -nr | head -n 10

Apache problem can affect the entire server.     With the Apache problem, this seems to have been encountered less frequently but it has occurred several times in the last few days.   # grep 'MaxRequestWorkers' /usr/local/apache/logs/error_log [Tue Nov 18 17:27:00.590507 2025] [mpm_prefork:error] [pid 3243:tid 3243] AH00161: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting [Wed Nov 19 11:28:39.530182 2025] [mpm_prefork:error] [pid 3231:tid 3231] AH00161: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting [Fri Nov 21 20:03:31.287851 2025] [mpm_prefork:error] [pid 3054:tid 3054] AH00161: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting   The current Apache limits are shown below, which are also set to the default values.   # grep -Ei "(MaxRequestWorkers|ServerLimit)" /etc/apache2/conf/httpd.conf ServerLimit 256 MaxRequestWorkers 150   The foll...

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  show ip cache flow show ip flow top-talkers Yacine:   show ip cache flow show ip cache flow | include Prot|SrcIf|DstIf  Rafraîchissement toutes les 3 secondes show interfaces | include line protocol|rate | refresh 3 sur le router

 Apache Guacamole is a clientless remote desktop gateway. It supports standard protocols like VNC, RDP, and SSH. We call it clientless because no plugins or client software are required. Thanks to HTML5, once Guacamole is installed on a server, all you need to access your desktops is a web browser.