Upload Linux_Automation_1_Sample.txt

Linux_Automation_1_Sample.txt

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+UBUNTU LINUX ADVANCED TROUBLESHOOTING SCENARIOS
+Generated: Thu Feb 26 06:10:09 MST 2026
+Total scenarios: 30000
+Features: Dynamic difficulty, system state tracking, progressive degradation
+<h>
+📋 PROBLEM:
+System is running slowly and needs investigation. Users report intermittent failures.
+
+💻 SYSTEM CONTEXT:
+• OS: Ubuntu 22.04.1 LTS (Jammy Jellyfish)
+• Kernel: 5.15.0-56-generic
+• Hostname: staging-139-169-41prod
+• User: deploy
+• Uptime: 9 days, 13:00
+• Load average: 0.64, 2.98, 0.60
+⚠️  ERROR MESSAGE:
+   High load average and application timeouts
+
+🔍 AVAILABLE COMMANDS:
+
+   1. kill -9 1
+      └ Kill init/systemd process
+
+   2. top -b -n 1
+      └ Check running processes and resource usage
+
+   3. echo 3 > /proc/sys/vm/drop_caches
+      └ Drop filesystem caches
+
+   4. reboot
+      └ Restart the system (drastic)
+
+❓ Which command would you run to troubleshoot this issue?
+<eot>
+<b>deploy@staging-139-169-41prod:~$  top -b -n 1
+
+<eot><h>📤 COMMAND OUTPUT:
+
+top - 06:10:09 up 9 day, 5 users,  load average: 0.64, 2.98, 0.60
+Tasks:  20 total,   2 running, 18 sleeping,   0 stopped,   0 zombie
+%Cpu(s): 6.4 us,  14.9 sy,  0.0 ni, 73.7 id,  3.0 wa,  0.0 hi,  0.0 si,  0.0 st
+MiB Mem :     5 total,     2 free,     2 used,     1 buff/cache
+MiB Swap:     3 total,     3 free,     0 used.     2 avail Mem 
+
+    PID USER      PR  NI    VIRT    RES    SHR S  %%CPU  %%MEM     TIME+ COMMAND
+  1006 root     20   0    634    88    88 S  9.9  2.8   937:28 /usr/sbin/postgresql
+  1013 root     20   0    218    90    90 S  8.4  0.6   478:53 /usr/sbin/php8.2-fpm
+  1001 root     20   0    144    79    79 S  8.2  2.3  1065:54 /usr/sbin/ufw
+  1002 root     20   0    412    63    63 S  8.1  3.2   820:56 /usr/sbin/ssh
+  1008 mysql    20   0    113    83    83 S  7.5  3.8   425:04 /usr/sbin/mysql
+  1003 root     20   0    216    70    70 S  7.3  3.1  1304:37 /usr/sbin/php8.1-fpm
+  1010 root     20   0    434    86    86 S  7.3  0.4  1132:19 /usr/sbin/samba
+   678 root     20   0    551    78    78 S  7.0  0.4   986:15 /lib/systemd/systemd-udevd
+  1005 root     20   0    644    42    42 S  6.9  4.6  1430:15 /usr/sbin/snapd
+   892 systemd+ 20   0    268    78    78 S  6.5  2.7     8:21 /lib/systemd/systemd-timesyncd
+<eot><b>🔍 Root cause: Multiple factors could cause slow performance: high CPU, memory pressure, I/O wait, or network issues.
+🔧 Resolution: Use standard Linux troubleshooting tools to identify the bottleneck: top, iostat, vmstat, netstat.
+✅ Verification: Identify the root cause and resolve accordingly.
+
+📊 System state evolving...
+<eot>
+<h>
+📋 PROBLEM:
+Nginx fails to start with error 'Address already in use' on port 80. Apache was previously installed but should have been removed.
+
+💻 SYSTEM CONTEXT:
+• OS: Ubuntu 20.04.5 LTS (Focal Fossa)
+• Kernel: 5.4.0-135-generic
+• Hostname: ip-237-151-2prod
+• User: dev1
+• Uptime: 7 days, 21:00
+• Load average: 2.85, 0.62, 0.53
+⚠️  ERROR MESSAGE:
+   nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
+
+🔍 AVAILABLE COMMANDS:
+
+   1. ss -tulpn | grep :80
+      └ Find which process is using port 80
+
+   2. systemctl status nginx
+      └ Check nginx status
+
+   3. journalctl -u nginx
+      └ Check nginx logs
+
+   4. systemctl restart nginx
+      └ Restart nginx (will likely fail again)
+
+❓ Which command would you run to troubleshoot this issue?
+<eot>
+<b>dev1@ip-237-151-2prod:~$  ss -tulpn | grep :80
+
+<eot><h>📤 COMMAND OUTPUT:
+
+tcp   LISTEN 0      128    0.0.0.0:80    0.0.0.0:*    users:(("apache2",pid=1234,fd=4))
+<eot><b>🔍 Root cause: Another process (likely Apache) is still listening on port 80, preventing nginx from binding.
+🔧 Resolution: Find the process using port 80: sudo ss -tulpn | grep :80. Stop the conflicting service: sudo systemctl stop apache2. Then start nginx.
+✅ Verification: Start nginx and verify it's listening on port 80 with 'ss -tulpn | grep :80'.
+
+📋 Recommended next steps:
+   • systemctl stop apache2
+   • systemctl start nginx
+
+📊 System state evolving...
+<eot>
+<h>
+📋 PROBLEM:
+Server load average is 1.6, 3.2, 2.3 and CPU temperature is unusually high at 51.2°C. Users report extreme sluggishness.
+
+💻 SYSTEM CONTEXT:
+• OS: Ubuntu 23.10 (Mantic Minotaur)
+• Kernel: 6.5.0-14-generic
+• Hostname: db-94-5-224dev
+• User: admin
+• Uptime: 20 days, 22:00
+• Load average: 1.60, 3.15, 2.25
+⚠️  ERROR MESSAGE:
+   High CPU usage alert from monitoring (99% CPU)
+
+🔍 AVAILABLE COMMANDS:
+
+   1. renice -n 19 -p 9217
+      └ Lower process priority
+
+   2. killall -9 crypto-miner
+      └ Force kill processes by name
+
+   3. ps aux --sort=-%cpu | head -5
+      └ Find the most CPU-intensive process
+
+   4. systemctl isolate multi-user.target
+      └ Change runlevel
+
+❓ Which command would you run to troubleshoot this issue?
+<eot>
+<b>admin@db-94-5-224dev:~$  ps aux --sort=-%cpu | head -5
+
+<eot><h>📤 COMMAND OUTPUT:
+
+USER         PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
+ubuntu      9371 99.5  3.5    285    10 ?        Ss   0:47 /tmp/.crypto-miner
+root        1012  9.8  1.5    760    84 ?        Ss   0:11 /usr/sbin/cron
+root         678  9.7  3.3    456    59 ?        Ss   0:50 /lib/systemd/systemd-udevd
+root         523  9.7  1.3    438    55 ?        Ss   0:20 /lib/systemd/systemd-journald
+root        1001  9.6  0.3    967    44 ?        Ss   0:53 /usr/sbin/apache2
+root        1004  8.9  0.1    877    94 ?        Sl   0:19 /usr/sbin/bind9
+root        1016  8.2  0.3    719    61 ?        Ss   0:32 /usr/sbin/gitlab-runner
+root        1000  7.9  2.2    377    34 ?        Sl   0:57 /usr/sbin/memcached
+root        1015  7.8  0.1    566    23 ?        Ss   0:10 /usr/sbin/redis-server
+root        1005  7.5  3.3    907    65 ?        Ss   0:23 /usr/sbin/rabbitmq-server
+root        1014  7.1  2.5    484    91 ?        Ss   0:55 /usr/sbin/rsyslog
+root        1013  5.9  4.7    363    29 ?        Ss   0:49 /usr/sbin/nginx
+systemd+     892  5.3  0.4    222    52 ?        Sl   0:05 /lib/systemd/systemd-timesyncd
+root        1017  5.0  4.9    506    54 ?        Ss   0:25 /usr/sbin/php8.2-fpm
+mysql       1008  4.6  3.9    769    63 ?        Ss   0:21 /usr/sbin/mysql
+root        1002  4.1  3.2    282    27 ?        Sl   0:59 /usr/sbin/ufw
+root        1007  4.0  3.2    620    62 ?        Sl   0:52 /usr/sbin/elasticsearch
+root        1010  3.4  4.1    315    43 ?        Sl   0:46 /usr/sbin/samba
+root        1006  3.1  2.4    318    29 ?        Ss   0:32 /usr/sbin/postgresql
+root        1011  2.4  4.1    718    63 ?        Ss   0:23 /usr/sbin/network-manager
+root           2  2.4  2.1    651    48 ?        Sl   0:10 [kthreadd]
+root        1003  2.4  0.8    164    27 ?        Sl   0:05 /usr/sbin/ssh
+root        1009  1.3  1.6    110    45 ?        Ss   0:20 /usr/sbin/prometheus
+root           1  1.0  1.6    401    48 ?        Sl   0:47 /sbin/init
+root           3  0.0  4.7    514    49 ?        Ss   0:04 [ksoftirqd/0]
+<eot><b>🔍 Root cause: A crypto-miner process is consuming 99% CPU. Likely installed through compromised application or vulnerability.
+🔧 Resolution: Terminate the process: kill -9 [PID]. Investigate how it was installed and remove the binary. Check for unauthorized access in auth.log.
+✅ Verification: Run 'top' or 'ps aux' to confirm the process is gone. Monitor for reappearance.
+
+📋 Recommended next steps:
+   • kill -9 [PID]
+   • rm -rf /tmp/.crypto-*
+   • grep -r 'miner' /var/log/auth.log
+
+📊 System state evolving...
+<eot>
+<h>
+📋 PROBLEM:
+User 'web' needs to install a package but gets 'Permission denied' when running apt install. They need to set up a new service.
+
+💻 SYSTEM CONTEXT:
+• OS: Ubuntu 23.04 (Lunar Lobster)
+• Kernel: 6.2.0-39-generic
+• Hostname: app-134-184-151dev
+• User: web
+• Uptime: 24 days, 6:00
+• Load average: 1.03, 0.16, 1.55
+⚠️  ERROR MESSAGE:
+   E: Could not open lock file /var/lib/dpkg/lock-frontend - open (13: Permission denied)
+
+🔍 AVAILABLE COMMANDS:
+
+   1. groups
+      └ List user groups
+
+   2. cat /etc/sudoers | grep web
+      └ Check sudoers file
+
+   3. sudo apt update
+      └ Try updating package list with sudo
+
+   4. id
+      └ Check user's group membership
+
+❓ Which command would you run to troubleshoot this issue?
+<eot>
+<b>web@app-134-184-151dev:~$  id
+
+<eot><h>📤 COMMAND OUTPUT:
+
+uid=1169(web) gid=1169(web) groups=1169(web),web,adm
+<eot><b>🔍 Root cause: User lacks sudo privileges or is not in the sudo group.
+🔧 Resolution: Add user to sudo group: sudo usermod -aG sudo web (as root). Then log out and back in.
+✅ Verification: Run 'sudo apt update' successfully.
+
+📋 Recommended next steps:
+   • sudo usermod -aG sudo web
+   • newgrp sudo
+
+📊 System state evolving...
+<eot>
+<h>
+📋 PROBLEM:
+System is running slowly and needs investigation. Users report intermittent failures.
+
+💻 SYSTEM CONTEXT:
+• OS: Ubuntu 23.04 (Lunar Lobster)
+• Kernel: 6.2.0-39-generic
+• Hostname: worker-243-189-194001
+• User: app
+• Uptime: 20 days, 3:00
+• Load average: 0.54, 0.31, 1.90
+⚠️  ERROR MESSAGE:
+   High load average and application timeouts
+
+🔍 AVAILABLE COMMANDS:
+
+   1. top -b -n 1
+      └ Check running processes and resource usage
+
+   2. echo 3 > /proc/sys/vm/drop_caches
+      └ Drop filesystem caches
+
+   3. reboot
+      └ Restart the system (drastic)
+
+   4. kill -9 1
+      └ Kill init/systemd process
+
+❓ Which command would you run to troubleshoot this issue?
+<eot>
+<b>app@worker-243-189-194001:~$  top -b -n 1
+
+<eot><h>📤 COMMAND OUTPUT:
+
+top - 06:10:09 up 20 day, 3 users,  load average: 0.54, 0.31, 1.90
+Tasks:  24 total,   2 running, 21 sleeping,   0 stopped,   0 zombie
+%Cpu(s): 5.4 us,  1.6 sy,  0.0 ni, 88.0 id,  1.3 wa,  0.0 hi,  0.0 si,  0.0 st
+MiB Mem :    12 total,     7 free,     4 used,     2 buff/cache
+MiB Swap:    17 total,    16 free,     0 used.     8 avail Mem 
+
+    PID USER      PR  NI    VIRT    RES    SHR S  %%CPU  %%MEM     TIME+ COMMAND
+  1006 root     20   0    182    89    89 S  9.8  3.3   594:58 /usr/sbin/elasticsearch
+  1008 mysql    20   0    429    81    81 S  9.7  1.0   910:09 /usr/sbin/mysql
+  1002 root     20   0    859    76    76 S  9.0  3.7    98:38 /usr/sbin/bind9
+  1003 root     20   0    780    74    74 S  8.3  2.6  1151:10 /usr/sbin/docker
+     3 root     20   0    601    53    53 S  7.9  3.9  1069:28 [ksoftirqd/0]
+  1016 root     20   0    549    76    76 S  7.9  0.2   552:21 /usr/sbin/gitlab-runner
+   678 root     20   0    605    71    71 S  6.6  4.7  1121:29 /lib/systemd/systemd-udevd
+  1010 root     20   0    553    92    92 S  6.3  3.2   268:37 /usr/sbin/mongodb
+  1009 root     20   0    330    78    78 S  5.8  2.0  1127:31 /usr/sbin/prometheus
+  1015 root     20   0    201    18    18 S  5.7  3.8   259:19 /usr/sbin/redis-server
+<eot><b>🔍 Root cause: Multiple factors could cause slow performance: high CPU, memory pressure, I/O wait, or network issues.
+🔧 Resolution: Use standard Linux troubleshooting tools to identify the bottleneck: top, iostat, vmstat, netstat.
+✅ Verification: Identify the root cause and resolve accordingly.
+
+📊 System state evolving...
+<eot>