loganathan's questions

I'm trying to upgrade my Oracle Linux OS from 6.8 t0 7.x version by following the steps provided here https://docs.oracle.com/en/operating-systems/oracle-linux/7/relnotes7.5/ol7-upgrade-ol6.html

However, I'm getting stuck with the below step where I get the treeinfo not found error.

redhat-upgrade-tool-cli --network=7.5 --instrepo=http://yum.oracle.com/​repo/​OracleLinux/​OL7/​UEKR5/​RDMA/​x86_64 --debuglog=/tmp/upgrade.log --cleanup-post

ERROR

redhat_upgrade_tool.yum ERROR: Error downloading .treeinfo or treeinfo from repo http://yum.oracle.com/repo/OracleLinux/OL7/UEKR5/RDMA/x86_64/: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"

I'm not sure whether it's possible to do an in-place upgrade for OLS or not, any help would be really appreciated.

I'm using Sphinx search engine for my application, and I would like to add ruby code inside the sphinx.conf file to update some values dynamically based on my application server hostname? Is it possible to execute the ruby code inside sphinx.conf? Something like below

{
  type = mysql
  sql_host = testHost
  sql_user = test
  sql_pass = <%= D.decrypt("encrypted password") %> // Ruby CODE
  sql_db = {{database_name}}
  sql_query_pre = SET TIME_ZONE = '+0:00'
  sql_query_pre = SET SESSION group_concat_max_len = 32768
  sql_query_pre = SET NAMES utf8
 }

I'm trying to use single HAproxy Loadbalancer for multiple sites, but only one site is working for me cp_nodes, when I try to access second website it redirects to first website only.

global
   log /dev/log local0
   log /dev/log local1 notice
   chroot /var/lib/haproxy
   stats socket /run/haproxy/admin.sock mode 660 level admin
   stats timeout 30s
   user haproxy
   group haproxy
   daemon

defaults
   log global
   mode http
   option httplog
   option dontlognull
   timeout connect 5000
   timeout client 50000
   timeout server 50000

#Application Setup
frontend http_front
  bind *:80
  #redirect scheme https if !{ ssl_fc }
  stats uri /haproxy?stats
  acl cp_domains hdr(host) -i cloud.one.net
  acl admin_doamins hdr(host) -i cloud.two.net
  use_backend cp_nodes if cp_domains
  use_backend admin_nodes if admin_doamins # Not working, redirects to cp_nodes onlye 


frontend https_front
  bind *:443 ssl crt /etc/pki/cloud.pem
  stats uri /haproxy?stats
  acl cp_domains hdr(host) -i cloud.one.net
  acl admin_doamins hdr(host) -i cloud.two.net
  use_backend cp_nodes if cp_domains
  use_backend admin_nodes if admin_doamins

backend cp_nodes
  balance roundrobin
  server siteone.net 18.24.162.155:443 ssl check verify none
  server sitetwo.net 18.24.162.142:443 ssl check verify none

backend admin_nodes
  balance roundrobin
  server siteone.net:8081 18.24.162.155:8081
  server sitetwo.net:8081 18.24.162.142:8081

Log File

Dec 27 07:37:07 lb1 haproxy[21927]: Proxy http_front started.
Dec 27 07:37:07 lb1 haproxy[21927]: Proxy https_front started.
Dec 27 07:37:07 lb1 haproxy[21927]: Proxy cp_nodes started.
Dec 27 07:37:07 lb1 haproxy[21927]: Proxy admin_nodes started.

What is the proper way to pass variable from one machine to another machine via bash script? In the below code I am trying to get the input from user and want to pass the same to remote machine, but the value is not getting accessed in remote machine, can anyone let me know the proper way to do it?

NEWLINE=$'\n'
read -s -p "Enter App FQDN:${NEWLINE}" APP_FQDN
read -s -p "Enter App Password:${NEWLINE}" APP_PASSWORD
read -s -p "Enter VD Password:${NEWLINE}" VD_PASSWORD
sshpass -p "$APP_PASSWORD" ssh -o StrictHostKeyChecking=no -T root@$APP_FQDN << 'EOSSH'
if true; then
 su - presto << 'PRESTO'
 source ~/.bash_profile
 cd /opt/vm/vchs/presto_agent
 pwd
 KEY=$( cat /opt/vm/vchs/presto_agent/config/settings.yml |grep '^key:'|sed 's/^key: //')
 echo $KEY
 echo $VD_PASSWORD
 PASSWORD=$(ruby /opt/vm/vchs/presto_agent/lib/obfuscation_util.rb encrypt $KEY $VD_PASSWORD)
 echo $PASSWORD
PRESTO
else
 echo "False"
fi
EOSSH

While executing the above script $VD_PASSWORD is echo blanks

I Have two applications running on my server with domains

 x.abc.com
 admin.x.abc.com

x.abc.com is running on port 80
admin.x.abc.com is running on port 8080

I can able to access x.abc.com from browser, but when I try admin.x.abc.com, it is sending requests to x.abc.com only.

What is the proper way to configure two different web applications with different domain & port on single machine. Listed below my virtualhost files for x.abc.com & admin.x.abc.com respectively

<VirtualHost *:80>
    ServerName www.x.abc.com
    ServerAlias x.abc.com
    RailsEnv test
    DocumentRoot /home/cp/cp/public
   <Directory /home/cp/cp/public/>
   </Directory>
   LogLevel warn
   ErrorLog /home/cp/cp/log/error.log
   CustomLog /home/cp/cp/access.log combined
   RewriteCond %{HTTP_HOST} ^admin.x.abc.com
   RewriteRule (.*) http://localhost:8080/$1 [R=301,L]
</VirtualHost>

<VirtualHost *:8080>
    ServerName www.admin.x.abc.com
    ServerAlias admin.x.abc.com
    RailsEnv test
    DocumentRoot /home/cp/cp_admin/public
   <Directory /home/cp/cp_admin/public/>
   </Directory>
   LogLevel warn
   ErrorLog /home/cp/cp_admin/log/error.log
   CustomLog /home/cp/cp_admin/access.log combined
 </VirtualHost>

I am using Nagios to monitor my servers and I have an need to monitor the inter connectivity between different servers. For example assume that I have three servers A, B & C and all of these servers are already monitored by nagios using check_ping plugin.

Now I want to check connectivity between these three servers internally, I mean from

server A, B & C should be reachable, likewise from B, A & C should be reachable , same for server C

What is the way to do this using nagios.

Server A - can ping to servers B&C 
Server B - can ping to servers A&C 
Server C - can ping to servers B&C

I have tried with multiple ping command in server A, but it is not helpful because i cant able to find out whether server B/C is not reacheable from A

command[check_ping]=/usr/lib64/nagios/plugins/check_ping -H 10.16.15.137 -w 3000.0,80% -c 5000.0,100% -p 5 
command[check_ping]=/usr/lib64/nagios/plugins/check_ping -H 10.18.42.125 -w 3000.0,80% -c 5000.0,100% -p 5 


where
10.16.15.137 -> SERVER B 
10.18.42.125 -> SERVER C

I have installed & setup the Rabbitmq on Centos remote server. Later I created an file "rabbitmq.config" and added the line

[{rabbit, [{loopback_users, []}]}]

and then restarted the rabbitmq server. Again tried to login the rabbitmq management web interface from my local machine using the guest credentials, but getting

login failed

error message.What is the proper way to empty the loopback user settings for Rabbitmq in Centos.