Nagios

 Table of Contents

1. 
   Documentation
   
2. 
   How to install Nagios Core
   
   1. 
      On MacOS
      
   2. 
      On CentOS
      
      1. 
         Installing Nagios Plugins (2)
         
      2. 
         Installing Nagios NRPE Plugin (3)
         
   3. 
      On FreeBSD
      
3. 
   Updating Nagios
   
   1. 
      Updating NagiosGraph
      
   2. 
      Updating NagVis
      
4. 
   Upgrading Nagios
   
5. 
   Setting up Nagios
   
6. 
   Dark Theme
   
7. 
   It appears as though you do not have permission to view information for any of the services you requested..
   
8. 
   Adding Hosts
   
   1. 
      Linux
      
   2. 
      Windows
      
9. 
   connect to address 127.0.0.1 and port 22: Connection refused
   
10. 
    Error: Could not stat() command file ‘/usr/local/nagios/var/rw/nagios.cmd’!
    
11. 
    CHECK_NRPE: Receive header underflow
    
12. 
    nagios snmp vs nrpe
    
13. 
    NRPE: Command ‘check_init_service’ not defined
    
14. 
    NRPE: Unable to read output
    
15. 
    Bind to port 5666 on 0.0.0.0 failed: Address already in use.
    
16. 
    SWAP CRITICAL – 0% free (0 MB out of 0 MB) – Swap is either disabled, not present, or of zero size.
    
    1. 
       My Nagios server
       
    2. 
       My VPN servers
       
17. 
    nagios : user NOT in sudoers
    
18. 
    auth could not identify password for [nagios]
19. 
    nagios : command not allowed
    
20. 
    Apache Monitoring
    
    1. 
       URL Monitoring
       
21. 
    MySQL Monitoring
    
    1. 
       On CentOS
       
    2. 
       On Debian
       
22. 
    Is This Service Flapping? YES
    
23. 
    Error: Request contained command arguments, but argument option is not enabled!
    
24. 
    CPU status: NRPE: unable to read output
    
25. 
    CPU status: UNKNOWN: iostat not found or is not executable by the nagios user.
    
26. 
    Memory Utilization: (No output returned from plugin)
    
    1. 
       db server
       
    2. 
       vpn server
       
    3. 
       support server
       
    4. 
       Debian servers
       
27. 
    Processes States
    
28. 
    Processes States (2)
    
    1. 
       Web Servers
       
    2. 
       DB Servers
       
29. 
    Adding Hostgroups
    
30. 
    Adding Servicegroups
    
31. 
    Adding Contacts
    
32. 
    Adding Contactgroups
    
33. 
    Email Notifications – SMTP Configuration
    
34. 
    Disk Usage Monitoring
    
35. 
    Memory Monitoring
    
36. 
    Swap Memory Monitoring
    
37. 
    Users Monitoring
    
38. 
    Nagios Maps
    
39. 
    Nagios Graphs
    
40. 
    Custom plugins (1)
    
41. 
    System Load Monitoring
    
    1. 
       For 1 vCPU
       
    2. 
       For 2 vCPU
       
    3. 
       For 4 vCPU
       
    4. 
       For 8 vCPU
       
42. 
    (No output on stdout) stderr: connect to address 10.3.0.10 port 5666: Connection refused
    
43. 
    How to install Nagios Log Server
    
    1. 
       How to uninstall Nagios Log Server (TO BE COMPLETED)
       
44. 
    Refused to execute script
    
45. 
    Apply configuration required
    
46. 
    Service Commands
    
47. 
    Nagios Log Server – Creating Realtime Alerts
    
48. 
    No data available
    
49. 
    Nagios Log Server – my localhost listed twice
    
50. 
    Nagios Log Server – not receiving logs
    
51. 
    Nagios Log Server – creating queries
    
52. 
    Nagios Core – User Management
    
    1. 
       Adding Users
       
    2. 
       Removing Users
       
53. 
    Nagios Core – Column Legends
    
54. 
    Unable to install Nagios Core Client
    
55. 
    Disable notifications
    
56. 
    Nagios Log Server – Shutting Down
    
57. 
    JavaScript is disabled
    
58. 
    Warning: Service ‘aws’ on host ‘www-search’  has a notification interval less than its check interval!  Notifications are only re-sent after checks are made, so the effective notification interval will be that of the check interval.
    
59. 
    Check Intervals for Services
    
    1. 
       max_check_attempts:
       
    2. 
       check_interval:
       
    3. 
       retry_interval:
       
    4. 
       notification_interval:
       
    5. 
       To check a service every minute (Tested ok)
       
    6. 
       To check a service every hour (Tested ok)
       
    7. 
       To check a service every day (Tested ok)
       
60. 
    Windows Monitoring
    
61. 
    Windows – Establish communication
    
62. 
    Windows – Installing NSClient++
    
63. 
    Windows – Server port must be an integer
    
64. 
    Windows – Firewalls – Socket timeouts
    
65. 
    Windows – No performance data from command
    
66. 
    CRITICAL – Socket timeout
    
    1. 
       Problem 1:
       
    2. 
       Solution 1:
       
    3. 
       Problem 2:
       
    4. 
       Solution 2:
       
67. 
    HTTP WARNING: HTTP/1.1 404 Not Found
    
68. 
    HTTP WARNING: HTTP/1.1 403 Forbidden
    
69. 
    AWS ELB Monitoring
    
70. 
    Custom plugins (2)
    
71. 
    Parent – Child relationship
    
    1. 
       Parent node
       
    2. 
       Children nodes
       
72. 
    Internet outages