I try to maintain my systems updated, It generates problems but unmaintained machines have the incredible ability to create bigger problems. At Calidade Systems for internal infrastructure we choose Ovirt, It’s really easy to add hardware, storage and every month has new improvements, obviously it not a perfect solution, but the perfect virtualization environment does […]
Nowadays virtualization is a must but sometimes we found virtual machines runing in several plataforms. Having all your virtual machines in one platform helps you to centralize all the administration and reduces maintenance time cost. In this case we have a Centos 7 pet virtual machine and we need to migrate from VirtualBox 6 to […]
Windows Server 2019 comes with a secure default config, in this case one Windows 2019 needs access to a samba public share and gives error 0x80004005 when we try to reach the shared folder. Solution: Open Regedit navigate to HKLM\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters\ and set value to 1 in key AllowInsecureGuestAuth
Proxmox is a good solution for small bussines, you will get an hypervisor with scheduled backups. In some costumers we found problems receiving backup notifications, because isp network is blacklisted, proxmox server domain name is not well configured, trafict through port 25 is filtered and hundreds of small problems In this cases the faster solution […]
Today we get a lot of calls complaining about that remote share folders aren’t working in some windows 7 computers. The cause was the update KB4480970 it breaks SMBv2 protocol The only solution in uninstall the KB4480970 update and restar computer
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, […]
