Everything goes well while installing the Nagios 4.0.8 into Ubuntu 10.04 LTS. However Nagios Map section doesn't plotted the maps of the device. Displayed error like this way

Suddenly my home datacenter  vsphere lab show empty inventory in vSphere client. There was no any host at all. I have three ( Cisco IOU, CentOS 7, Ubuntu server) host configure for lab  purpose. So I must recover those host to complete my lab because I almost completed all labs.  Thus here is process how to retrieve those lost host from vSphere client in vSphere 6 database.


Step 1:
Login to the vSphere client choose your database from Configuration Tab > right click database and choose "Browse Dababase".

CREATE TABLE logs (
        id bigint unsigned NOT NULL AUTO_INCREMENT,

to

CREATE TABLE logs (
        id bigint(20) unsigned NOT NULL AUTO_INCREMENT,

On sql I have used this command to delete tables

MariaDB [(none)]> use syslog
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
MariaDB [syslog]> drop table {YourTableName};

Here are basic show commands used in Huawei switch. For configuration of Huawei switch click here.

1. Show VLANs
<sw1>display vlan

8. Show port base VLAN
<sw1>display port vlan  
Port                    Link Type    PVID  Trunk VLAN List
-------------------------------------------------------------------------------
Eth-Trunk0              hybrid       1     -                                
GigabitEthernet0/0/1    trunk        1     1
GigabitEthernet0/0/2    hybrid       1     -                                
GigabitEthernet0/0/3    access       301   -                                
GigabitEthernet0/0/4    access       302   -                                
GigabitEthernet0/0/5    hybrid       1     -                                
GigabitEthernet0/0/6    hybrid       1     -                                
GigabitEthernet0/0/7    hybrid       1     -                                
GigabitEthernet0/0/8    hybrid       1     -


2. View Configuration
[sw1]display current-configuration configuration
!Software Version V200R003C00SPC300
#
sysname sw1
#
vlan batch 301 to 302
#
stp region-configuration
 region-name JR
 instance 1 vlan 20 to 30
 active region-configuration
#
vlan 30
 description fiber
vlan 20
 description Wireless
[sw1-mst-region]active region-configuration

[sw1]display stp instance 0 interface GigabitEthernet 0/0/1 brief
 MSTID   Port                        Role  STP State     Protection
    0    GigabitEthernet0/0/1        DESI  FORWARDING      NONE



interface Eth-Trunk 1
port link-type trunk
port trunk allow-pass vlan 20 30
mode lacp

int gi0/0/5
eth-trunk1
undo negotiation auto

int gi0/0/6
eht-trunk1
undo negotiation auto


3. Show interface configuration
[sw1]display interface Eth-Trunk 1
Eth-Trunk1 current state : UP
Line protocol current state : UP




4. LACP port status

[sw1]display eth-trunk 1
Eth-Trunk1's state information is:
Local:
LAG ID: 1                   WorkingMode: LACP                              
Preempt Delay: Disabled     Hash arithmetic: According to SIP-XOR-DIP      
System Priority: 32768      System ID: 30d1-7eea-c824                      
Least Active-linknumber: 1  Max Active-linknumber: 8                      
Operate status: up          Number Of Up Port In Trunk: 2                  
--------------------------------------------------------------------------------
ActorPortName          Status   PortType PortPri PortNo PortKey PortState Weight
GigabitEthernet0/0/5   Selected 1GE      32768   1      305     10111100  1  
GigabitEthernet0/0/6   Selected 1GE      32768   2      305     10111100  1  

Partner:
--------------------------------------------------------------------------------
ActorPortName          SysPri   SystemID        PortPri PortNo PortKey PortState
GigabitEthernet0/0/5   32768    001b-0c17-b780  32768   515    1       10111100
GigabitEthernet0/0/6   32768    001b-0c17-b780  32768   514    1       10111100
VID  Status  Property      MAC-LRN Statistics Description  
--------------------------------------------------------------------------------
1    enable  default       enable  disable    VLAN 0001                      
301  enable  default       enable  disable    fiber                          
302  enable  default       enable  disable    Wireless


5. Show interface vlan

[sw1]display int Vlanif 25
Vlanif25 current state : UP
Line protocol current state : UP
Last line protocol up time : 2014-07-21 18:57:40 UTC-05:13
Description:
Route Port,The Maximum Transmit Unit is 1500
Internet Address is 10.10.10.11/24
IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 30d1-7eea-c824
Current system time: 2014-07-21 19:01:47-05:13
    Input bandwidth utilization  : --
    Output bandwidth utilization : --

6.  [sw1]ping 10.10.10.10  
  PING 10.10.10.10: 56  data bytes, press CTRL_C to break
    Reply from 10.10.10.10: bytes=56 Sequence=1 ttl=255 time=4 ms
    Reply from 10.10.10.10: bytes=56 Sequence=2 ttl=255 time=5 ms
    Reply from 10.10.10.10: bytes=56 Sequence=3 ttl=255 time=5 ms
    Reply from 10.10.10.10: bytes=56 Sequence=4 ttl=255 time=7 ms
    Reply from 10.10.10.10: bytes=56 Sequence=5 ttl=255 time=5 ms

  --- 10.10.10.10 ping statistics ---
    5 packet(s) transmitted
    5 packet(s) received
    0.00% packet loss
    round-trip min/avg/max = 4/5/7 ms

Here are some Huawei switch configuration command and verification command is here.


1. Enter int to the privilege mode
<sw1>system view

2. Create the VLAN
[sw1]vlan 30
[sw1]des fiber

3. Configure interface trunk
[sw1]interface GigabitEthernet 0/0/1
[sw1-GigabitEthernet0/0/1]port link-type trunk

4. Configure interface access
[sw1-GigabitEthernet0/0/3]port link-type access
[sw1-GigabitEthernet0/0/4]port link-type access

5. Assign vlan to that port
[sw1]vlan 30
[sw1-vlan30]port GigabitEthernet 0/0/3
[sw1]vlan 30
[sw1-vlan30]port GigabitEthernet 0/0/4

6. Change port speed and duplex
[sw1]interface GigabitEthernet 0/0/3
[sw1-GigabitEthernet0/0/3]undo negotiation auto
[sw1-GigabitEthernet0/0/3]speed ?
  10                10M port speed mode
  100               100M port speed mode
  1000              1000M port speed mode
  auto-negotiation  Auto negotiation
[sw1-GigabitEthernet0/0/3]speed 100
[sw1]int gi0/0/4
[sw1-GigabitEthernet0/0/4]undo negotiation auto
[sw1-GigabitEthernet0/0/4]speed 100

[sw1-GigabitEthernet0/0/4]duplex ?
  full  Full-Duplex mode
  half  Half-Duplex mode
[sw1-GigabitEthernet0/0/4]duplex full


7. Configure VLAN and add VLAN in trunk port
[sw1-GigabitEthernet0/0/1]port trunk allow-pass vlan 301 302
Info: This operation may take a few seconds. Please wait for a moment...done.

8. MST Configuration

[sw1]stp region-configuration
Info: Please activate the stp region-configuration after it is modified.
[sw1-mst-region]region-name JP
[sw1-mst-region]instance 1 vlan instance 1 vlan 10 20 30 to 50 600 to 616
[sw1-mst-region]instance 0 vlan 302

9. Create management interface
[sw1]interface Vlanif 25
Error: Can not create this interface because the interface number of this type has reached its maximum.
[sw1]undo interface Vlanif 1
[sw1-Vlanif25]ip add 10.10.10.11 255.255.255.0
[sw1-Vlanif25]ip route-static 0.0.0.0 0.0.0.0 129.102.0.2


10. Configure SSH

[sw1]rsa local-key-pair create
The key name will be: sw1_Host
The range of public key size is (512 ~ 2048).
NOTES: If the key modulus is greater than 512,
       it will take a few minutes.
Input the bits in the modulus[default = 2048]:1024
Generating keys...
.....++++++
..........++++++
.................+++++
...+++++

11. Create local user
[sw1]aaa
[sw1-aaa]local-user jpudasaini password ?
  cipher               User password with cipher text
  irreversible-cipher  User password with irreversible-cipher text
  <cr>

[sw1-aaa]local-user jpudasaini password
Please configure the login password (8-16)
It is recommended that the password consist of at least 2 types of characters, including lowercase letters, uppercase letters, numerals and special characters.
Please enter password:
Please confirm password:
Info: Add a new user.

[sw1-aaa]local-user jpudasaini service-type ssh telnet

12. Configure telnet session
[sw1]stelnet server enable
[sw1]ssh authentication-type default password
[sw1]ssh user jpudasaini
[sw1]ssh user jpudasaini authentication-type password
[sw1]ssh user jpudasaini service-type stelnet


[sw1]user-interface vty 0 4
[sw1-ui-vty0-4]authentication-mode aaa
[sw1-ui-vty0-4]protocol inbound ssh



[sw1-aaa]local-user jpudasaini privilege level 15
[sw1-aaa]local-user jpudasaini service-type ssh
[sw1]ssh authentication-type default password

13. DHCP Snooping enable
[huawei-sw1]dhcp enable
[huawei-sw1]dhcp snooping enable ipv4
[huawei-sw1]dhcp server detect

[huawei-sw1]dhcp snooping check dhcp-rate enable
<huawei-sw1>display dhcp snooping
[huawei-sw1]dhcp snooping check dhcp-rate 50

14. Apply to VLAN
[huawei-sw1]vlan 301
[huawei-sw1-vlan301]dhcp snooping enable

15. Apply to Interface
[huawei-sw1-GigabitEthernet0/0/3]dhcp snooping enable
[huawei-sw1-GigabitEthernet0/0/3]dhcp snooping check dhcp-rate enable


16. Apply to Trunk port
[huawei-sw1-GigabitEthernet0/0/4]dhcp snooping trusted


17. Verify Command
[huawei-sw1]display dhcp snooping configuration    
#
dhcp snooping enable
dhcp snooping check dhcp-rate enable
dhcp snooping check dhcp-rate 50
dhcp server detect
#
vlan 301
 dhcp snooping enable
#
interface GigabitEthernet0/0/3
 dhcp snooping enable
 dhcp snooping check dhcp-rate enable
#
interface GigabitEthernet0/0/4
 dhcp snooping trusted

Hi, recently when I'm trying to install some linux daemon in CentOS 7 I have encountered a PERL issue, indicating that some module are missing e.g.

Can't locate sys/syslog.pm in @INC

It means it can't find the pear-sys-syslog. So I have to install this daemon to continue my installation. In my case its syslog.pm but you may encounter different than this. I mean the module name is different, but the error code is same. You need to search that package and install it. In my case I have just used this module

root@localhost#yum install -y perl-sys-syslog

Now the installation has been working. 

Here are some useful command in day to day life while troubleshooting the juniper switch. 

1. show mac add of specific vlan
  root@jpudasaini#show ethernet-switching table vlan 608

2. compare configure before commit
  root@jpudasaini#show | compare

3. check mac add
  root@jpudasaini#show ethernet-switching table brief

4. show perticular Mac in Juniper
  root@jpudasaini#show ethernet-switching table | match d4ca.6dea.d420

5. show port description/status
  root@jpudasaini#show interfaces descriptions statistics

6. Show configuration in configuration mode
  root@jpudasaini#show configuration | display set

7. show correctness of the command before commit
  root@jpudasaini#commit check

8. Show Link Layer detection Protocol 
  root@jpudasaini#show protocols lldp 

9. Show vlan in configuration mode
root@jpudasaini#show vlans | display set