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#Version 2018.06.01.0001
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#run the setup program for authentication, network, firewall, services, etc
/usr/sbin/setup

LD_LIBRARY_PATH in RedHat is LD_LIBRARY 

cat /proc/cpuinfo   #get speed/size/type cpu
getconf WORD_BIT    #returns 32 or 64 for bit proc type


Virtual Interface
ifconfig
	ifconfig eth0:1 192.168.76.24 netmask 255.255.252.0 \
						broadcast 192.168.79.255 up

Virtual Interface
Or using the iproute2 utility ip, for example:
	ip addr add 192.168.76.24/24 dev eth0

	#ip addr del 192.168.76.24/24 dev eth0

#######################################
sed -e \
	's/.*release[[:blank:]]*\([[:digit:]][[:graph:]]*\).*/\1/' \
	/etc/redhat-release     

#######################################
Send gather grab snap of system: sosreport
   yum install sos
   sosreport
   	# <= rhel 6
		/tmp
   	# >= rhel 7
		/var/tmp

#######################################
#Get "not signed" for a pkg
yum -y --nogpgcheck install PKGNAME   #ignores signature

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truss - strace

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#Setup Bonding or etherchannel/teaming for redhat Server

ethtool eth0

ethtool eth1

modprobe --list | grep bonding

	/lib/modules/2.6.*/kernel/drivers/net/bonding/bonding.ko

modprobe --list | grep mii

	/lib/modules/2.6.*/kernel/drivers/net/mii.ko

	#EITHER
	vi /etc/modprobe.d/bonding.conf
		alias bond0 bonding

	#or
	vi /etc/modprobe.conf

		alias bond0 bonding

modinfo bonding

	#older way, but the options should be in the ifcfg-bondX file
	vi /etc/modprobe.conf
		options bond0 mode=1 arp_ip_target=x.x.x.x arp_interval=200 primary=eth0

#This configuration use arp resquest on the primary interface each 200ms

#Now the kernel module is configure and we have to load thoses modules :

modprobe bonding

modprobe mii

vi /etc/sysconfig/network-script/ifcfg-eth0

	DEVICE=eth0
	BOOTPROTO=none
	ONBOOT=yes
	MASTER=bond0
	SLAVE=yes
	USERCTL=no

vi /etc/sysconfig/network-script/ifcfg-eth1

	DEVICE=eth1
	BOOTPROTO=none
	ONBOOT=yes
	MASTER=bond0
	SLAVE=yes
	USERCTL=no

#Configuration of bond0

vi /etc/sysconfig/network-script/ifcfg-bond0

	DEVICE=bond0
	BOOTPROTO=none
	ONBOOT=yes
	NETMASK=255.255.255.0
	IPADDR=x.x.x.x
	USERCTL=no

#> RHEL 7
service network restart

#<= RHEL 7
systemclt restart network

cat /proc/net/bonding/bond0

################################################################################
#record a DVD (mkisofs and DVD recording in once command)
growisofs -dvd-compat -Z /dev/dvd=image_file.iso

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watch -nX cmd    # where X is an integer of seconds to sleep

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mdadm   #disk mirroring - like disksuite

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partprobe   
## OR
echo 1 > /sys/block/sdX/device/rescan

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lvm.conf
#######################################

pvscan
vgscan

vi /etc/lvm/lvm.conf

   filter = [...]

#Once a filter has been configured and lvm.conf saved, check the output of
#these commands to ensure that no physical volumes or volume groups are
#missing:

pvscan
vgscan

#Once the desired filter is configured, it is recommended to rebuild
#the initrd with mkinitrd (RHEL4 and 5) or dracut (RHEL 6) so that
#only the necessary devices are scanned upon reboot.

##############################################################################
#The following command moves all allocated space off the physical volume
#/dev/sdc to other free physical volumes in the volume group:
pvmove /dev/sdc

#The following command moves just the extents of the logical volume MyLV.
pvmove -n MyLV /dev/sdc
pvmove -n MyLV OLDDISK  NEWDISK

# The following command moves all extents allocated to the physical
#volume /dev/sdc over to /dev/sdf in the background.
pvmove -b /dev/sdc /dev/sdf

#The following command reports the progress of the move as a percentage at
#five second intervals.
pvmove -i5 /dev/sdd

#############################################################################
#Move a LV out of one VG into another VG
	#it must not have shared segements on disk
		lvdisplay -v --maps LV
		lvdisplay --maps -v /dev/mapper/vgorabd001d112base-lvorab005
		pvmove -n lvorab005 /dev/mapper/mpathr /dev/mapper/mpathdz
		lvdisplay --maps -v /dev/mapper/vgorabd001d112base-lvorab005
	#the LV must be inactive
		umount /odcld001/exp
		lvchange -an /dev/mapper/vgorabd001d112base-lvorab005

#vgsplit EXISTINGVG         NEWVG         -n LV
vgsplit vgorabd001d112base vgorax0010001d -n lvorab005

lvchange -ay /dev/mapper/vgorax0010001d-lvorab005
mount -t ext4 /dev/mapper/vgorax0010001d-lvorab005 /odcld001/exp

##############################################################################
#If you did a "vgchange -c y VG" and didn't mean to, but cannot undo it
#   with a "vgchange -c n VG", then do the following ***IF you know it isn't
#   being used***
vgchange -cn vgname --config 'global {locking_type = 0}'

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Significant startup file for disks:
	/etc/rc.sysinit

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sar -B 5   #see swap and paging stats
numactl --hardware
lscpu
lstopo
numastat
numastat -c
numastat -mczs
numastat -c qemu

ps -eo min_flt,maj_flt,cmd,args,uid,gid   #maj/min page faults per process

##############################################################################
#list the top processes w/ a 5 second delay
top -d 5

	F or O
		p  = swap sorting

##############################################################################
#Grow a VMDC then get the OS to see it

Resize the vmdk using VMware's management tools.
Rescan the scsi bus on the guest so that it sees the new size.

   MYDEV=sdba

   echo 1 > /sys/block/$MYDEV/device/rescan


   for HOST in $(cd /sys/class/scsi_host; ls -d host*)
   do
      echo $HOST
      echo "- - -" > /sys/class/scsi_host/$HOST/scan
   done

   fdisk -l /dev/$MYDEV

   pvresize /dev/$MYDEV

   pvscan; pvs
 
   #lvextend  ...
   #resize2fs ...

##############################################################################
#Fix a RPM database corruption

#Mount the iso file with –o loop to a mountpoint

mount -o loop myfile.iso /mnt/loop/

zgrep Packages filelist.*

#Create a tmp folder e.g. under /tmp/… go into this new tmp folder
#And run the command 

afio -i -y var/adm/backup/rpmdb/SOMEFILE.gz
/mnt/loop/archives/###.afio.bz2

#You get a extracted folder  - in this case a
	#/var/adm/backup/rpmdb/Packa…. 

#Copy the Package..gz file to the a300s741 and unzip the packages – 
#remove / rename the original one under /var/lib/rpm/backup/
#And run a 

rpm -rebuilddb

##############################################################################
#rhel 7
	#=======================================================================
	#system state
	#=======================================================================
		#Boot targets are:
			#System supports multiple users, graphical and textbased logins
			graphical.target

			#System supports multiple users, text-based logins
			multi-user.target

			#sulogin prompt, basic system initialization
			rescue.target

			#sulogin prompt, initramfs pivot complete and system 
			#  root mounted read-only on /
			emergency.target

		systemctl
		systemctl list-unit-files  #like service --status-all
		systemctl --type=TYPE
		systemctl status UNIT -l
		systemctl list-units --type=TYPE
		systemctl list-unit-files --type=TYPE

		systemctl poweroff
		systemctl reboot

		#change the current target on a booted system
		systemctl isolate TARGET

		#Change current status of a unit
			systemctl start UNIT
			systemctl stop UNIT
			systemctl restart UNIT
			systemctl reload UNIT
		#Change the boot-time status of a unit
			systemctl enable UNIT
			systemctl disable UNIT

		#Mask a unit (so you don't have NetworkManager and network both running)
			systemctl mask UNIT
			systemctl unmask UNIT

		#what is my default?
		systemctl get-default
			ls -l /etc/systemd/system/default.target
			
		#Change my default
		systemctl set-default multi-user.target

		#Booting
		The following steps are taken when the system boots
		– Power on (UEFI or BIOS performs POST, identifies boot device)
			Configured with a BIOS key combination (often F2)
		– Loads the boot loader from disk (grub2 for RHEL7)
			Configured with grub-install
		– Boot loader loads its configuration and presents a menu
			/etc/grub.d/*, /etc/default/grub, and /boot/grub2/grub.conf
		– Boot loader loads the selected kernel and initial RAM disk image
			/etc/dracut.conf
		Boot loader passes control over to the kernel
		– /etc/grub.d/*, /etc/default/grub, and /boot/grub2/grub.conf
			Kernel initializes hardware, then runs /sbin/init from the
		   initramfs (which is systemd in RHEL7)
		– Configured using init= kernel parameter
			Initramfs systemd executes all units in initrd.target target
		– Mounts actual root file system as /sysroot (/etc/fstab)
			/sysroot becomes / and installed systemd executed
			systemd looks for a default target
		– Either configured on system or passed as kernel parameter
		– /etc/systemd/system/default.target


		#different target for a bootup (override the link)
		vi /boot/grub/grub.conf
			systemd.unit=TARGET

		  #or
		reboot, interrupt boot, edit kernel line
			linux16 
					systemd.unit=rescue.target
					systemd.unit=emergency.target

		#recover root password

			#systemd targets still require a password to access the system
			#Instead of appending systemd.unit=TARGET, append rd.break
			#This option stops the boot process before the initramfs
			#  switches to the actual system

			linux16 
				rd.break  #append to kernel line

			mount -o remount,/w /sysroot
			chroot /sysroot
			passwd root
			touch /.autorelabel

	#=======================================================================
	#Network
	#=======================================================================
		ip addr show NIC
		ip -s link show NIC
		ip route

		#command "ss" replaces netstat
		ss -ta
		ss -tl 

		#network config - replace ifconfig?
		nmcli con show
		nmcli con show --active
		nmcli con show NAME
		nmcli dev status
		nmcli con add-name "static" ifname eth0 ...
		nmcli con up "static"
		nmcli con up "default"

		nmcli con add help

		nmcli con reload
		nmcli con down NAME
		nmcli con up   NAME

        hostnamectl
        nmcli device status
        nmcli con s
        nmcli con s --active
        nmcli -f name,autoconnect con s
        nmcli -p         con s "System eth0"
        nmcli -f active  con s "System eth0"
        nmcli -f profile con s "System eth0"

	#=======================================================================
	#Install 
	#=======================================================================
	#Virtual console functions
	– Ctrl-Alt-F1 – main installer console with debugging info
	– Ctrl-Alt-F2 – shell prompt with root access
	– Ctrl-Alt-F3 – installation log
	– Ctrl-Alt-F4 – storage log
	– Ctrl-Alt-F5 – program log from other utilities
	– Ctrl-Alt-F6 – spare shell prompt?
	– Ctrl-Alt-F7 – default console with GUI installation
	#Red Hat Enterprise Linux 7.1
	– All programs are in tmux panes on first virtual console

	#=======================================================================
	OLD: /etc/sysconfig/network
	hostnamectl status
	hostnamectl set-hostname FQDN

##############################################################################
Performance 
	systemtap
	PCP - performance co-pilot
	dmstat

##############################################################################
SAP
	sapconf
##############################################################################
Puppet and chef
	both ruby based

##############################################################################
Docker - compete is rocket

opensift - compete is vmware
	openshift.com
		webforms

##############################################################################
 collectl -p file1 [file2 ...] 
 	/var/log/collectl
 	
##############################################################################
#Tuning
#To install tuned:

yum -y install tuned

#Now start the services provided by tuned:

systemctl start ktune
systemctl enable ktune
	service tuned start
	chkconfig tuned on

#To find the current active profile and state of service:

tuned-adm active
	#Current active profile: default
	#Service tuned: enabled, running
	#Service ktune: enabled, running

#To list all the available profiles:

tuned-adm list
	#Available profiles:
	#- default
	#- throughput-performance
	#- laptop-ac-powersave
	#- spindown-disk
	#- desktop-powersave
	#- laptop-battery-powersave
	#- latency-performance
	#- server-powersave
	#- enterprise-storage
	#Current active profile: default

#To switch to a different profile:
tuned-adm profile enterprise-storage

#Each profile has 4 configuration file under
#/etc/tune-profiles/<profile-name>. If you want to create a profile of your
#own, simply copy one of the profile directory with a different name, change
#the config files inside it according to your own requirement and activate it.
#    ktune.sh  ktune.sysconfig  sysctl.ktune  tuned.conf

#In case if you want to disable all tuning, then run:
tuned-adm off

##############################################################################
#initial RH setup:
wget -qO- \
  http://satellite/pub/bootstrap/bootstrap-rhel6-released-virtual.sh \
  | bash 

##############################################################################
date: timedatectl

##############################################################################
#2016.09.08
IF you use the nmcli to setup things, it will manage/overwrite the
/etc/resolv.conf on each restart of the network (systemctl restart network
||  reboot).

The nmcli doesn't manage ALL the possible options that it should.

need nmcli command to do options in resolv.conf
What problem/issue/behavior are you having trouble with? What do you expect
to see? nmcli overwrites the following in /etc/resolv.conf (though we have
the other values setup via nmcli commands) options rotate attempts:5
timeout:1 

Is there a nmcli command for this? We currently have chattr +i
/etc/resolv.conf setup to keep anything from overwriting it (from another
knowledgebase article) Using static, not DHCP (so PeerDNS=no doesn'...

What problem/issue/behavior are you having trouble with? What do you expect
to see? nmcli overwrites the following in /etc/resolv.conf (though we have
the other values setup via nmcli commands) options rotate attempts:5
timeout:1

 Is there a nmcli command for this? We currently have chattr +i
 /etc/resolv.conf setup to keep anything from overwriting it (from another
 knowledgebase article) Using static, not DHCP (so PeerDNS=no doesn't apply) 

 Where are you experiencing the behavior? What environment? all rhel 7
 systems 

 When does the behavior occur? Frequently? Repeatedly? At certain times?
 whenever NetworkManager restarts What information can you provide around
 timeframes and urgency? needed for our Oracle RAC settings


 The response by Redhat, is that it is a known bug, and may be handled in the
 future:  

 My name is Nilesh Parmar. I will be assisting you on this case. Currently
 there is no such option for setting "dns-options" with nmcli. We already
 have the RFE filed for this request: ------ Bug 1264410 - Cannot set DNS
 options [internal bugzilla]
 https://bugzilla.redhat.com/show_bug.cgi?id=1264410 ------


 So, the fix around this, is to setup the /etc/resolv.conf the way you
 want/need, and set it to non-writeable by ANYTHING

 chattr +i /etc/resolv.conf

    #to edit it at anytime:    chattr -i /etc/resolv.conf, edit, then chattr
	+i /etc/resolv.conf


	Bad work-around, but the way it is now.


##############################################################################
#Usually the /etc/udev/rules.d/70-persistent-net.rules file can simply be
#deleted and it'll be regenerated upon reboot. But sometimes it's not or not
#fully regenerated. In these cases you can try either of these:

    udevadm trigger
	#udevadm trigger --action=add

##############################################################################
#use:  _netdev as an option to the san&nas mounts
#/etc/fstab, add option: _netdev  

	#netdev says to delay/wait until SAN drivers are loaded before mounting
	example: /dev/mapper/mpath0    /mymount ext3    defaults,_netdev   1 2

##############################################################################
#dynamic, not persistent after reboot
	ethtool -s eth0 speed 100 duplex full autoneg off

#persistent after reboot
	vi /etc/sysconfig/network-scripts/ifcfg-eth0
		ETHTOOL_OPTS="speed 100 duplex full autoneg off"
	#Restart the interface to apply changes :
	ifdown eth0 && ifup eth0

##############################################################################
#ethtool like - different/better:  

	yum -y install biosdevname
	biosdevname -d   #give MACs

##############################################################################
#change the NIC names

/usr/sbin/system-config-network
/usr/sbin/system-config-network-gui
/usr/sbin/system-config-network-tui

#/usr/sbin/system-config-network -e > /tmp/network.config

#Replace each occurrence of the
  #ethN name in /tmp/network.config with the
  #corresponding
  #emX or pXpY name as provided by the map.

#Import the modified network configuration .

#/usr/sbin/system-config-network –i < /tmp/network.config

##############################################################################
#get packages by repo

yum repolist

#disable all, then only enable the one you want, google in this example
yum --disablerepo="*" --enablerepo="google" list available

##############################################################################
#yum history

yum history list
yum history list all
yum history summary

yum history summary 1..5

yum history package-list subscription-manager\*
yum history package-list \*

##############################################################################
#Pem - product subscriptions

#cd /etc/pki/product
#restorecon -Rv /etc/pki/product
#chown root.root /etc/pki/product/69.pem
#chmod 644 /etc/pki/product/69.pem
#
#/etc/pki/product-default  #old
#/etc/pki/product
#/etc/pki/consumer
#/etc/pki/entitlement

rct cat-cert /etc/pki/product/69.pem

subscription-manager config --list
	#/etc/rhsm/rhsm.conf


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