similar to: What is best way of managing isolated network environment?

Hello All, I guess it is very common for administrative purpose, to dump and restore a CentOS 7 system. I usually use dump/restore commands. However, I?m having trouble to handle installing bootloader and creating initramfs for C7 system. Does anyone know a good document source that details those procedure? Thank you, Xinhuan Zheng

Hello Everyone, We are using CentOS 5 system for certain application. Those are VM guests running in VMware. There is datastore issue occasionally, causing all file systems becoming read only file systems. So application stop working, and opened files cannot be written either. We cannot even ssh login to the system. Typically we had to power cycle the VM. We are trying to add reliability to the

Hi, I am recovering a CentOS 5.4 system. I've copied all partitions into the recovery system. I've installed grub boot loader. However, the original system is using /dev/sdb1 for root (/), while the recovery system is using LVM (/dev/vg0/lv1) for root (/). When recovery system boots, I got the panic error: * Mounting /dev/sdb1 on /sysroot * Mount: mounting

Am 17.12.2014 um 18:42 schrieb Les Mikesell <lesmikesell at gmail.com>: > On Wed, Dec 17, 2014 at 11:14 AM, Xinhuan Zheng > <xzheng at christianbook.com> wrote: >> I have a requirement that I need to use encryption technology to encrypt >> very large tar file on a daily basis. The tar file is over 250G size and >> those are data backup. Every night the server

Hello CentOS list, I have a requirement that I need to use encryption technology to encrypt very large tar file on a daily basis. The tar file is over 250G size and those are data backup. Every night the server generated a 250G data backup and it?s tar?ed into one tarball file. I want to encrypt this big tarball file. So far I have tried two technologies with no success. 1) generating RSA 2048

Dear Earl Ramirez, >I created a custom ISO a couple of years ago [0], you can use it as >your base of one of the following links[1-4], should be sufficient to >get you started. >[0] https://github.com/EarlRamirez/snipeit_iso In above github project, in https://github.com/EarlRamirez/snipeit_iso/blob/master/isolinux/grub.conf file, there is ?@? symbol for splashimage, and for kernel,

Dear All, Below question has been puzzled me for a while, and don?t know if anyone has experienced such puzzle: You have an external array attached to a physical hardware. The operating system is CentOS 5. The file system is created on top of LVM on external array & mounted. The CentOS 5 can see the array controller, and manage all LVM configuration, etc. There is data stored in that

Hi All, I have a Quantum scalar i40 tape library. I need to configure it to TWO tape partition libraries, e.g., library_a and library_b, so that each library has its own tape drive. Then connect this physical tape library to two different CentOS servers so that each server can see its own media changer and tape drive. I once had a successful configuration on one host but NOT on the other. One

Hello, Today I searched redhat official portal and learned that Sendmail is considered deprecated. By default, CentOS 7 will use postfix as MTA. I need good advise on what it means to us. We are CentOS customers. We use that operating system for quite a few years. We rely on Sendmail for years for us to relay large quantity of emails to our customers for marketing purpose. We build our additional

(Couldn't find the original request in my email but definitely have an idea). Set up an OpenVPN server on your network and create a client on the isolated network (set up to connect on boot), configure routing appropriately. You get to decide what subnet the VPN IP address is on, in this situation I recommend a static IP address for the client. From your network you connect to the OpenVPN IP

Dear All, > It seems like kickstart is what you are looking for.? > Is this what you were trying to do? Yes, kickstart is what I?m looking for. Let me detail my provisioning process: * Provision a VM with standard CentOS 7 NetInstall ISO & my post script. The file system is created on top of LVM * Export entire VM as custom ISO image to be loaded into physical hardware *

On Wed, Dec 17, 2014 at 12:14 PM, Xinhuan Zheng <xzheng at christianbook.com> wrote: > Hello CentOS list, > I have a requirement that I need to use encryption technology to encrypt > very large tar file on a daily basis. The tar file is over 250G size and > those are data backup. Every night the server generated a 250G data backup > and it?s tar?ed into one tarball file. I

We currently use a combination of Kerberos and NIS to manage users on our CentOS 6 systems in a Windows AD environment. NIS is provided by Windows Services for UNIX (or something named similarly), which has some issues, and is also not going to be supported by Microsoft in the future. NIS supplies the passed file as well as the auto mount map for home directories as shown by this excerpt from

Dear All, I want to create a CentOS 7 VMWARE VM. I need to install various Runtime libraries, e.g., Tomcat, into the VM. Once all looks good, then I want to make a Custom Image of the entire VM. Later I want to load this Custom Image to a physical HW, so that I don?t need to go through all kinds Runtime installation. Does anyone know how to handle creating a Custom Image and Load to physical HW

On Wed, Dec 17, 2014 at 11:14 AM, Xinhuan Zheng <xzheng at christianbook.com> wrote: > I have a requirement that I need to use encryption technology to encrypt > very large tar file on a daily basis. The tar file is over 250G size and > those are data backup. Every night the server generated a 250G data backup > and it?s tar?ed into one tarball file. I want to encrypt this big

On 17/12/14 18:54, Leon Fauster wrote: > Am 17.12.2014 um 18:42 schrieb Les Mikesell <lesmikesell at gmail.com>: >> On Wed, Dec 17, 2014 at 11:14 AM, Xinhuan Zheng >> <xzheng at christianbook.com> wrote: >>> I have a requirement that I need to use encryption technology to encrypt >>> very large tar file on a daily basis. The tar file is over 250G size

On Aug 21, 2019, at 7:35 AM, Xinhuan Zheng <xzheng at christianbook.com> wrote: > > my $s = IO::Select->new( $fh ); > if ( $io->can_write( 10 ) { That?s not designed to do what you hope. select(2) is a system call intended for use on network socket handles, not file handles. Since socket handles and file handles are compatible on a Unix type system (including CentOS) the

On 2019-09-25 11:31, Xinhuan Zheng wrote: > Hello All, > > I guess it is very common for administrative purpose, to dump and restore a CentOS 7 system. Though I can not answer OP's question, I have question of my own. Is this really routine (often) task for Linux sysadmins? I used something like that to replicate cluster nodes in the past, but kickstart would be routine task for

I have been looking for environment variables for the %post section of kickstart. Namely if I start my kickstart command with "linux ks=http://serverip/ks.cfg" is there an environment variable that has serverip that I can use in the %post section? Also is there a way to pass a command line argument to the %post section when running kickstart command as the above

Hi, I tried to make kickstart environment a little bit more charming by firing up openssh daemon in the limited environment. I edited/checked a bunch of files and almost succeeded but still not. I can reach the machine to run a command like 'ssh -x <kickstartClient> <command>' and it does work for %pre and both chroot and non-chroot %post sections, in fact, you can run a