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23 Mayıs 2021 Pazar

Linux / Change ip address in RHEL 6.1

ifconfig ile aktif kart kontrole edilip, ilgili kart üzerindeki konfig değiştirilerek network servisi restart edilir.

[root@server ~]# ifconfig

bond0 Link encap:Ethernet HWaddr 80:RT:BA:82:44:4A

inet addr:192.168.11.24 Bcast:192.168.2.255 Mask:255.255.255.0

/etc/sysconfig/network-scripts/ifcfg-eth0

/etc/sysconfig/network-scripts/ifcfg-bond0

[root@server ~]# vi /etc/sysconfig/network-scripts/ifcfg-bond0

DEVICE=bond0

IPADDR=192.168.11.25

NETMASK=255.255.255.0

GATEWAY=192.168.2.1

ONBOOT=yes

BOOTPROTO=none

USERCTL=no

NM_CONTROLLED=no

TYPE=Bond

BONDING_MASTER=yes

BONDING_OPTS="mode=4 miimon=100 lacp_rate=1"

service network restart

17 Mayıs 2021 Pazartesi

Linux / Ubuntu update

Ubuntu update için aşağıdaki komutları kullanabiliriz.

root@ubuntuserver:~$ sudo apt update

Hit:1 http://tr.archive.ubuntu.com/ubuntu focal InRelease

Hit:2 http://tr.archive.ubuntu.com/ubuntu focal-updates InRelease

Hit:3 http://tr.archive.ubuntu.com/ubuntu focal-backports InRelease

Hit:4 http://tr.archive.ubuntu.com/ubuntu focal-security InRelease

Reading package lists... Done

Building dependency tree

Reading state information... Done

All packages are up to date.

root@ubuntuserver:~$ apt list --upgradable

Listing... Done

Upgrade edilebilecek paketlerin olması durumunda aşağıdaki komut ile yapılabilir.

root@ubuntuserver:~$sudo apt upgrade

11 Mayıs 2021 Salı

Linux / NFS

Linux sistemler üzerinde nfs tanımları için aşağıdaki adımları uygulayabiliriz.

SLES 15 SP2 de NFS Client kurulu geliyor, yast2 uygulaması ile NFS client ayarları yapılabilir.

systemctl status nfs-server.service

systemctl reload nfs-server.service

nfsserver:~ # rpm -qa |grep nfs

nfs-client-2.1.1-10.10.1.x86_64

yast2-nfs-client-4.2.8-1.13.noarch

nfs-kernel-server-2.1.1-10.4.1.x86_64

nfsidmap-0.26-3.3.1.x86_64

yast2-nfs-server-4.2.4-1.68.noarch

libnfs8-1.11.0-1.28.x86_64

yast2-nfs-common-4.2.4-1.68.noarch

rpm -Uhv nfs-kernel-server-2.1.1-6.10.2.x86_64.rpm

rpm -Uhv yast2-nfs-server-4.0.1-3.3.1.noarch.rpm

nfsserver:~ # cat /etc/exports

#NFS SERVER

/sapmnt 1.1.1.101(rw,root_squash,sync,no_subtree_check) 1.1.1.102(rw,root_squash,sync,no_subtree_check) 1.1.1.103(rw,root_squash,sync,no_subtree_check) 1.1.1.104(rw,root_squash,sync,no_subtree_check) 1.1.1.105(rw,root_squash,sync,no_subtree_check)

/usr/sap/trans 1.1.1.101(rw,root_squash,sync,no_subtree_check) 1.1.1.102(rw,root_squash,sync,no_subtree_check) 1.1.1.103(rw,root_squash,sync,no_subtree_check) 1.1.1.104(rw,root_squash,sync,no_subtree_check) 1.1.1.105(rw,root_squash,sync,no_subtree_check)

app1:/ # df -h -T |grep nfs

1.1.1.123:/sapmnt nfs4 200G 13G 188G 7% /sapmnt

1.1.1.123:/usr/sap/trans nfs4 250G 288M 250G 1% /usr/sap/trans

app1:/usr/sap/trans # ls

ls: cannot open directory '.': Permission denied

Bu hatanın çözümü için NFS server üzerindeki klasörde yetkilendirme yapıldı

---------------------------------------------------------

nfsserver:/ # ls -ld /usr/sap/trans

drwxrwx--x 13 root sapsys 147 Mar 17 14:10 /usr/sap/trans

nfsserver:/ # chmod o+rw /usr/sap/trans

nfsserver:/ # ls -ld /usr/sap/trans

drwxrwxrwx 13 root sapsys 147 Mar 17 14:10 /usr/sap/trans

-----------------------------------------------------------

app1:/usr/sap/trans # cat /etc/fstab

/dev/vg-swap/lv-swap swap swap defaults 0 0

/dev/vg-system/lv-root / ext4 defaults 0 1

/dev/vg-usrsap/lv-usrsap /usr/sap xfs defaults 0 0

UUID=A3C1-7B78 /boot/efi vfat defaults 0 2

#NFS CLIENT

1.1.1.123:/usr/sap/trans /usr/sap/trans nfs defaults 0 0

1.1.1.123:/sapmnt /sapmnt nfs defaults 0 0

10 Mayıs 2021 Pazartesi

Linux / ISCSI disk mount

ISCSI ile login olunarak diskin mount edilmesi için aşağıdaki komutları çalıştırabiliriz.

iscsiadm -m node -l

mount /dev/dg_fd28fc2b7dc06/lv_f8dc0b3c09ad4 /app_data

2 Nisan 2021 Cuma

Linux / Ubuntu 20.10 netplan apply

Ubuntu Server 20.10 versiyonunda /etc/netplan altindaki diger dosyalardan da ip aliyor, tek bir dosya olmasi daha uygun gözüküyor.

sudo vi /etc/netplan/00-installer-config.yaml

# This is the network config written by 'subiquity'

network:

ethernets:

ens160:

addresses:

- 192.168.x.28/24

gateway4: 192.168.x.1

nameservers:

addresses:

- 192.168.x.109

- 192.168.x.152

- 192.168.x.134

search:

- domain.com.tr

version: 2

sudo netplan apply

root@ubuntu20:~$ lsb_release -a

No LSB modules are available.

Distributor ID: Ubuntu

Description: Ubuntu 20.10

Release: 20.10

Codename: groovy

17 Mart 2021 Çarşamba

Linux / Read-only file system

Linux sistem üzerinde input/output hataları sonrasında boot problemi oluşabilir.

Bu durumda kurulum medyası ile Rescue Mode erişim yapılarak / bağlı olduğu disk bolümünde fsck yapılabilir.

Örnek: fsck /dev/vg0/lv0

servername:/boot # ls
ls: cannot open directory '.': Input/output error

servername:/boot # cat /et-bash: cannot create temp file for here-document: Input/output error
-bash: cannot create temp file for here-document: Input/output error
servername:/ # cat /etc/os-bash: cannot create temp file for here-document: Read-only file system
-bash: cannot create temp file for here-document: Read-only file system
-bash: cannot create temp file for here-document: Read-only file system
-bash: cannot create temp file for here-document: Read-only file system

12 Mart 2021 Cuma

Linux / sudo yetkili kullanıcılar

Aşağıdaki komut ile sudo yetkili gruplar kontrol edilebilir.

[root@servername ~]# grep -v "#" /etc/sudoers |grep "ALL="

root ALL=(ALL) ALL

%wheel ALL=(ALL) ALL

Aşağıdaki komutlar ile de grup üyeleri kontrol edilebilir.

[root@servername ~]# grep "root:" /etc/group

root:x:0:root

[root@servername ~]# grep "wheel:" /etc/group

wheel:x:10:

4 Mart 2021 Perşembe

Linux / SUSE 15 SP2 upgrade

The easiest upgrade path is consecutively installing all service packs.

For the SUSE Linux Enterprise 15 product line (GA and the subsequent service packs) it is also supported to skip one service pack when upgrading.

For example, upgrading from SLE 15 GA to 15 SP2 or from SLE 15 SP1 to 15 SP3 is supported.

https://documentation.suse.com/sles/15-SP2/html/SLES-all/book-sle-upgrade.html

18 Kasım 2020 Çarşamba

Linux / Changing the Size of an XFS File System with xfs_growfs

The size of an XFS file system can be increased by using the xfs_growfs command when the file system is mounted. Reducing the size of an XFS file system is not possible.

servername:~ # sudo xfs_growfs -d /sapmnt

meta-data=/dev/mapper/sapmnt-lv0 isize=512 agcount=32, agsize=33554304 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0 rmapbt=0
= reflink=0
data = bsize=4096 blocks=1073737728, imaxpct=5
= sunit=2 swidth=1024 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=521728, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 1073737728 to 1342172160

dosya sistemi 5TB a extend edilmiştir.

https://documentation.suse.com/sles/15-SP1/html/SLES-all/cha-resize-fs.html

9 Ekim 2020 Cuma

Linux / SUSEConnect -list-extensions

hostname:~ # SUSEConnect -list-extensions

AVAILABLE EXTENSIONS AND MODULES

Advanced Systems Management Module 12 x86_64

Activate with: SUSEConnect -p sle-module-adv-systems-management/12/x86_64

Containers Module 12 x86_64

Activate with: SUSEConnect -p sle-module-containers/12/x86_64

HPC Module 12 x86_64

Activate with: SUSEConnect -p sle-module-hpc/12/x86_64

Legacy Module 12 x86_64

Activate with: SUSEConnect -p sle-module-legacy/12/x86_64

Public Cloud Module 12 x86_64

Activate with: SUSEConnect -p sle-module-public-cloud/12/x86_64

SUSE Linux Enterprise High Availability GEO Extension 12 SP4 x86_64

Activate with: SUSEConnect -p sle-ha-geo/12.4/x86_64 -r ADDITIONAL REGCODE

SUSE Linux Enterprise Live Patching 12 SP4 x86_64

Activate with: SUSEConnect -p sle-live-patching/12.4/x86_64 -r ADDITIONAL REGCODE

SUSE Linux Enterprise Point of Service Image Server 12 SP2 x86_64

Activate with: SUSEConnect -p sle-pos/12.2/x86_64 -r ADDITIONAL REGCODE

SUSE Linux Enterprise Server LTSS 12 SP4 x86_64

Activate with: SUSEConnect -p SLES-LTSS/12.4/x86_64 -r ADDITIONAL REGCODE

SUSE Linux Enterprise Software Development Kit 12 SP4 x86_64

Activate with: SUSEConnect -p sle-sdk/12.4/x86_64

SUSE Linux Enterprise Workstation Extension 12 SP4 x86_64

Activate with: SUSEConnect -p sle-we/12.4/x86_64 -r ADDITIONAL REGCODE

SUSE Package Hub 12 SP4 x86_64

Activate with: SUSEConnect -p PackageHub/12.4/x86_64

Toolchain Module 12 x86_64

Activate with: SUSEConnect -p sle-module-toolchain/12/x86_64

Web and Scripting Module 12 x86_64

Activate with: SUSEConnect -p sle-module-web-scripting/12/x86_64

MORE INFORMATION

You can find more information about available modules here:

https://www.suse.com/products/server/features/modules.html

8 Ekim 2020 Perşembe

Linux / SUSE register

SUSEConnect -r YourActivationCode -e YourEmailAddress

hostname:~ # SUSEConnect --cleanup For register cleanup

Error: Invalid system credentials, probably because the registered system was deleted in SUSE Customer Center.
Check https://scc.suse.com whether your system appears there. If it does not, please call SUSEConnect --cleanup and re-register this system.

hostname:~ # SUSEConnect -r YourActivationCode -e YourEmailAddress For register

Registered SLES_SAP 12.4 x86_64

To server: https://scc.suse.com

Using E-Mail: email@domain.com

Successfully registered system.

Linux / dmidecode

Fiziksel sanal kontrolü için dmidecode uygulaması ile kontrol edebiliriz.

dmidecode | grep Product

dmidecode -t system

Linux / Storage Command Line Tool

storcli64 show all

storcli64 /c4 show all

storcli64 /c4/dall show all

storcli64 /c1/e28/s12 show rebuild

hostname:~ # storcli64

Storage Command Line Tool Ver 1.18.11 Feb 09, 2016

help - lists all the commands with their usage. E.g. storcli help

<command> help - gives details about a particular command. E.g. storcli add help

List of commands:

Commands Description

-------------------------------------------------------------------

add Adds/creates a new element to controller like VD,Spare..etc

delete Deletes an element like VD,Spare

show Displays information about an element

set Set a particular value to a property

get Get a particular value to a property

compare Compares particular value to a property

start Start background operation

stop Stop background operation

pause Pause background operation

resume Resume background operation

download Downloads file to given device

expand expands size of given drive

insert inserts new drive for missing

transform downgrades the controller

/cx Controller specific commands

/ex Enclosure specific commands

/sx Slot/PD specific commands

/vx Virtual drive specific commands

/dx Disk group specific commands

/fall Foreign configuration specific commands

/px Phy specific commands

/[bbu|cv] Battery Backup Unit, Cachevault commands

Other aliases : cachecade, freespace, sysinfo

Use a combination of commands to filter the output of help further.

E.g. 'storcli cx show help' displays all the show operations on cx.

Use verbose for detailed description E.g. 'storcli add verbose help'

Use 'page=[x]' as the last option in all the commands to set the page break.

X=lines per page. E.g. 'storcli help page=10'

Use J as the last option to print the command output in JSON format

Command options must be entered in the same order as displayed in the help of

the respective commands.

10 Eylül 2020 Perşembe

SUSE / Augeas parsing/serializing error

Augeas parsing/serializing error: Iterated lens matched less than it should at /usr/share/augeas/lenses/dist/hosts.aug:23.12-.42:

Resolution

Add a line break at the end of /etc/hosts as below :

echo >> /etc/hosts

Cause

The last line in /etc/hosts does not have line termination "\n".

This can be verified by doing e.g. 'cat /etc/hosts', and not seeing the bash prompt on a new line as a result.

https://www.suse.com/support/kb/doc/?id=000019057

23 Mayıs 2019 Perşembe

SUSE / Template den Yeni Sanal Makine Oluşturma

SUSE template makinesinden yeni sanal makine oluşturmak için aşağıdaki adımları kullanabiliriz.

1. SUSE_TEMP makinesi kullanılara yeni sanal makine oluşturulur.

2. root - password bilgileri ile konsol açılır.

3. hostnamectl set-hostname yeni_hostname komutu ile yeni sunucu adı tanımlanır.

4. nano /etc/sysconfig/network/ifcfg-eth0 komutu ile dosya açılarak, IPADDR= satırındaki IP adresi degiştirilerek dosya kaydedilir.

5. nano /etc/hosts komutu ile dosya açılarak, yeni IP adresi ve hostname düzenlenip dosya kaydedilir.

6. reboot komutu ile sistem yeniden başlatılır.

22 Ağustos 2017 Salı

SUSE / Setting Up Bonding Devices

Run YaST > Network Devices > Network Settings.
Use Add and change the Device Type to Bond. Proceed with Next.
Select how to assign the IP address to the bonding device. Three methods are at your disposal:
- No IP Address
- Dynamic Address (with DHCP or Zeroconf)
- Statically assigned IP Address
Use the method that is appropriate for your environment.
In the Bond Slaves tab, select the Ethernet devices that should be included into the bond by activating the related check box.
Edit the Bond Driver Options. The modes that are available for configuration are the following:
- balance-rr
- active-backup
- balance-xor
- broadcast
- 802.3ad
- balance-tlb
- balance-alb
Make sure that the parameter miimon=100 is added to the Bond Driver Options. Without this parameter, the data integrity is not checked regularly.
Click Next and leave YaST with OK to create the device.

https://www.suse.com/documentation/sles11/book_sle_admin/data/sec_bond.html

create a symbolic link command

ln -s /path/to/file /path/to/symlink

ln -s file1 link1

ln -s {/path/to/file-name} {link-name}

ln -s /opt/dpsapps/dbappagent/bin/hdbbackint hdbbackint

11 Temmuz 2017 Salı

Linux / # mpathconf oluşturma

# mpathconf --enable --with_multipathd y

Multipath.conf dosyasının oluşturulması

Host san scan

echo "- - -" > /sys/class/scsi_host/hosth/scan

2 Haziran 2017 Cuma

How to change hostname in linux

hostnamectl status

hostnamectl set-hostname name

Linux / HugePages Parameter

grep Huge /proc/meminfo

/etc/sysctl.conf

- /etc/exports

- /etc/security/limits.conf

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