A blog for all the virtualization and operating system troubleshooting

How to increase ESXi webclient login user application timeout

To increase the default 15min timeout to 2hr

on the right top corner ->Click the User login tab

Select "Settings"

Select the "Application Timeout"

Click "2hrs" instead of the initial 15mins

Linux how to make iscsi session automatic

Enable:

Edit parameters in /etc/iscsi/iscsid.conf:

Edit node startup from 'manual' to 'automatic'

so that logins to the iSCSI LUNs are automatic after a system reboot: node.startup = automatic

curl: (60) SSL certificate problem: self-signed certificate

Error:

while running curl with https url getting below error:

curl: (60) SSL certificate problem: self-signed certificate

Solution:

add -k or --insecure in your curl command

example:

curl -k --request POST <>

How to present a iscsi lun to a linux machine for creating file system

On the linux machine :

1)Find out the iscsi name of the host:

cat /etc/iscsi/initiatorname.iscsi

note:in RHEL install "yum install iscsi-initiator-utils" if initiatorname.iscsi not found

2)discover the target storage array using iscsi target IP:

iscsiadm -m discovery -t st -p <target IP>

this output will be having iqn number about the storage target

3)make an iscsi I-T session on the host:

iscsiadm -m node -T <IQN of target> -p <target IP> --login

4)verify the IT connection session by:

iscsiadm -m session

5)present a LUN from array and export to the host using IQN of the host

6)After LUN presented do a rescan of iscsi device by:

rescan-scsi-bus.sh

7)Create a new file sytstem on the new device and mount

mkfs /dev/sdb

mkdir /mount1

mount /dev/sdb /mount1

Error Validating Storage Provider: mount failure, server: 1.1.1.1, export: /nfs1, nfs version: 3, returned state: 13

NFS share mount on client failed:

Error Validating Storage Provider: mount failure, server: 1.1.1.1, export: /nfs1, nfs version: 3, returned state: 13

Solution:

On the NFS server:

vi /etc/exports nclude insecure option as

/nfs1 *(rw,sync,insecure,no_subtree_check,no_root_squash)

then run: exportfs -a

morpheus UI loading hangs

Error:

After morpheus UI hangs saying loading.

Solution :

edit /etc/morpheus/morpheus.rb file and mark below paramter as "false"

ui['morpheus_hub_enabled'] = false

Then run:
morpheus-ctl stop morpheus-ui
morpheus-ctl reconfigure

morpheus-ctl start morpheus-ui

ubuntu set hostname permananantly

Run below command:

hostnamectl set-hostname <new hostname>

To verify check the file "/etc/hostname"

ESXI command to find network details like IP Netmask and gateway

Use below command:

esxcli network ip interface ipv4 get

KVM virsh-install Error ImportError: /usr/lib/vmware/libxml2.so.2: version `LIBXML2_2.9.11' not found (required by /usr/lib/python3/dist-packages/libxml2mod.cpython-310-x86_64-linux-gnu.so)

Error:

Try to create VM using virsh-install and get error on ubuntu KVM:

ImportError: /usr/lib/vmware/libxml2.so.2: version `LIBXML2_2.9.11' not found (required by /usr/lib/python3/dist-packages/libxml2mod.cpython-310-x86_64-linux-gnu.so)

Solution:

1.Install

apt-get install libxml2 libxml2-dev

2.export LD path:

export LD_LIBRARY_PATH=/usr/lib/x86_64-linux-gnu:$LD_LIBRARY_PATH

Delete Archive logs safely | oracle server keeps running out of space

$ORACLE_HOME/bin/rman <<EOF

connect target /

crosscheck archivelog all;

delete noprompt expired archivelog all;

exit

EOF

use below command to delete for specific days:

RMAN>delete archivelog all completed before 'SYSDATE-1'; # keeps archive from last day