Just need install fping package for your distro
For Fedora, CentOS, AlmaLinux etc.
yum install fping -y
For Debian, Ubuntu etc.
apt install fping -y
We are ready now for tests:
fping -a -A -l host1 host2 host3 host4 etc...
fping -a -A -l cloudflare.com bbc.com yahoo.com google.com
Params:
- -a Show systems that are alive
- -A Display targets by address rather than DNS name
- -l Loop sending packets to each target indefinitely. Can be interrupted with Ctrl-C; statistics about responses for each target are then displayed.
ElasticSearch error:
failed to create query: field expansion matches too many fields, limit: 1024, got: 1380
To fix it, add "indices.query.bool.max_clause_count: 2048" in elasticsearch.yml
echo 'indices.query.bool.max_clause_count: 2048' >> /etc/elasticsearch/elasticsearch.yml
Restart elasticsearch:
systemctl restart elasticsearch
При разрешен публичен web interface-а на VMWare ESXI и/или SSH достъпа, много ботове се опитват да bruteforce-ват. Активира се вградена brute force защита. В предишната статия активирах логването с ssh ключ. Когато се логваме с ключ, дори да е блокиран уеб достъпа, логването с ключ работи. След като се логнем по ssh на сървъра, със следната команда reset-ваме web interface достъпа.
pam_tally2 --user root --reset
За да видим колко невалидни опити за логване са регистрирани:
pam_tally2 --user root
ssh-copy-id root@esxihost
Enter the current password.
ssh root@esxihost
Enter the current password again.
After you are login with password just copy from local directory .ssh/authorized_keys to the /etc/ssh/keys-root/auhtorized_keys
root@esxihost# cat .ssh/authorized_keys >> /etc/ssh/keys-root/authorized_keys
root@esxihost# exit
And now you can login with ssh key to the VMWare ESXI
