Change Passwd in Single user mode

Single user mode :
Step1 :#reboot
Step2# Press key to enter grub
Step3# e-  to edit
Step4# select the second line to edit
Step5#Go to the end of line and add "single"
Step 6#select b to boot
Step 7# passwd <username>

vMA Logging the ESX/ESXi servers

vilogger to consolidate ESX/ESXi  logs on diffrent servers.

Adding an ESX/ESXi servers to vMA logging :-

vilogger enable --server <esx servername> --numrotation 20 --maxfilesize 10(MB) --collectionperiod 10

./vilogger --help

cd /var/log/vmware

Important Things ESXi:
ESXi servers don't save log files when the power is lost or when servers are rebooted

vMA Session Files

Session Files : Alternative way to Fast Pass

#cd  /usr/share/doc/vmware-vcli/samples/session

#./save_session.pl --help

Adding a ESX/ESXi server to session files :-
#./save_session.pl --server <esx servername> --username XXXX --password XXXXX --savesessionfile /home/vi-admin/esx147

#vicfg-nics -l --sessionfile /home/vi-admin/esx147

vMA Fastpass

vi-Fastpass :
Managing mutiple esx and esxi servers
vifptarget --help

Adding an ESX/ESXi server:
vifp addserver <esx servername> (To add the servers)
credientials

Listing the ESX/ESXi servers added:-
vifp listservers (to look at servers added to Vi-Fastpass) we can also add Vcenter

Setting an ESX/ESXi as target:-
vifptarget -s <esxi servername> (To set the target)
vicfg-vSwitch -l

Clear an ESX/ESXi targets:-
vifptarget  -c (to clear the target)

vMA(vSphere Management Assitant)

Vsphere Managment Assitant

64-bit Red Hat  Enterprise Linux,Vmware tools,vCLI
Esx should be 64 bit,ESX/ESXi 3.5 U2 or 4.0 later
Requirments :Single CPU only,512 MB,5GB Virtual Disk
Download vMA as OVF template from vmware and deploy

vMA Commands:
root#cd  /usr/bin
root#ls *vicfg*

Runing an vMA Command
vicfg-nics --list --server <esxi servername>
credetails

Configuring SNMP for ESX host

Step1 :root@etc]# cd snmp
Step 2:root@snmp]# ls
Step 3:root@snmp]# vi snmpd.conf
Step 4:root@snmp]# chkconfig snmpd on
Step 5:root@snmp]# esxcfg-firewall -e snmpd
Step 6:root@snmp]# service snmpd start
Step 7 :root@snmp]# snmpwalk -v1 -c public localhost .1.3.6.1.4.1.6876 |grep 6876.1

Intalling HP SIM Manually

Installing HP SIM agent on ESX box:

Step1 :tar -xzvf  hpmgmt-8.1.1-vmware3x.tgz
Step 2:rpm -ivh package name
Step 3:rpm -qa | grep hp
Step 4:root# service pegasus start
Step5:root# service pegasus status
Step 6: hpasm  activate or hpasm reconfigure
Step 7:service hpasm start
Step 8: Serivce snmpd start
Step 9: Firewall Config
esxcfg-firewall --openport 2301,tcp,in,hp-sim
esxcfg-firewall --openport 280,tcp,out,sim-cert
esxcfg-firewall --openport 2381,tcp,in,hpim
Step 10:service firewall restart
Step 11:chkconfig snmpd on
Step 12:esxcfg-firewall -e snmpd
Step 13:service snmpd start

opening and closing Firewall ports

Opening the Firewall ports :
Syntax: esxcfg-firewall --openPort <port_number>,tcp|udp,in|out,<port_name>

Examples :
 root]# esxcfg-firewall --openport 2301,tcp,in,hp-sim

 root]# esxcfg-firewall --openport 514,udp,out,syslog

 root]# esxcfg-firewall --openport 280,tcp,out,sim-cert

 root]# esxcfg-firewall --openport 2381,tcp,in,hpim

Closing the Firewall ports:
Syntax: esxcfg-firewall --closePort <port_number>,tcp|udp,in|out,<port_name>

Example :
 root]#esxcfg-firewall --closePort 6380,tcp,in


service firewall restart
esxcfg-firewall-e| d SERVICE

Syslog Config

Syslog Config

 # vi syslog.conf
# service syslog restart
# esxcfg-firewall -q|grep syslog
        syslog              : port 514 udp.out

KB Article :1005030

DRS

DRS Requirments:
You should have Enterprise or Enterprise plus
Requirments :
Vmotion requirments should be met.
-VM's have access to same networks
-Compatible CPUs on source and destination hosts
-Hosts have Vmotion enabled Vkernal interface
-No attached CD/DVD drives or VMDirectPath.

Packet/Protocol Analyser

Packet/Protocol Analyser

Physical:
Port-mirror,SPAN (Switch Port Analyzer),RSPAN
Basically you connect your Laptop to a Port or Group ports with same Vlan in promiscous mode.
promiscous mode accetps all traffic.

Linux Packet capture :TCPDUMP and Wireshark tcp anaylse the traffic.
Step1:Configure promiscuous mode to a new Portgroup.
Step2:Your packet capture VM where Wireshark is installed should be on the same portgroup where promiscous mode is conifgured.

TCPDUMP:
-i =specify the interface
-v =Verbose
-W =Write packets to a file
-r =Read packets from a file
tcpdump -i vswif0 host <ipaddress> to watch DNS traffic,arp traffic becoz of DNS lookup

Check for NX flag

VMotion fails : Incompatible CPU

Check for NX flag in the ESX host and  disable it in BIOS.

To check if NX flag is set on ESX host

root# cat  /proc/cpuinfo

VMware KB Article :1993