In each node check the content of /var/lib/mysql/grastate.dat version: 2.1 uuid: 9a50c4ec-4332-11e8-8b88-77564bb9f22a seqno: 45 safe_to_bootstrap: 0 select the node with the highest value in seqno and edit the value of safe_to_bootstrap to 1 should be like these version: 2.1 uuid: 9a50c4ec-4332-11e8-8b88-77564bb9f22a seqno: 45 safe_to_bootstrap: 1 in these node run systemctl start mysql@bootstrap.service in the other […]
Sometimes we need to check hostvars in our ansible hosts. a quick way to get this done should be
Generally Small and Medium Business doesn’t have a own mail server in office. If we want to receive notifications we can configure Xenserver to use an existing email account to relay messages. #1 Open a ssh session in desired Xenserver install #2 Edit your ssmtp file #3 Your ssmtp.conf file should have these values #4 […]
Updates are good, they improve our system security and add more feature to our software. In this case after updating a Centos 7.3 installation to 7.4 suddenly a customer old printer cant store scan jobs in a samba share. After enable verbose log in samba configuring option we saw some entries like unfortunately our printer […]
At Calidade Systems we check our customer daily backup report. Today we detect the lack of one report. We connect to our customer Linux server and saw a unusual high CPU load but no processor usage, if we don’t have cpu usage the cause should be storage, we are sending backups to a NFS server, […]
In some cases a system administrator needs to use old versions of certain software in order to get a development version. In this case we need to deploy a JBoss 7 AS inside a Centos 7. Remember that JBoss 7 AS is unmaintaned and no loger supported. Try Wildfly for production Second this is a […]
Recently I have to deal with a old Dell SC1430 server it was really difficult to find diagnostic table I share here I you need to check For more info Poweredge SC1430 Manual
increase Memory and replace CPU is a fast way to improve performance in a workstation, recently during a workstation upgrade we found a strange behavior in the motherboard The cause of this strange behavior is that motherboard socket has bent pins
Proxmox is a good solution for single servers infrastructure, you can use a single server where you can house all customer virtual machines. Recently one customer talked us about small problems with a legacy software, He has problems storing data, we make a check and index rebuilt in his database and everything start to work […]
One of my clients needs to renew an very old router, We choose an Edgerouter lite because has a incredible price, performance is more than enough for client internet capacity and the customer needs a VPN between two offices Both locations have dynamic ip, so we choose to use a dynamic dns service ( no-ip […]
