search for: xinhuan

...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

...itch_root: bad newroot /sysroot * Kernel panic - not syncing: Attempted to kill init! I've changed the recovery system fstab to use the correct devices. I deleted recovery system etc/lvm/cache/.cache file. But it still doesn't work. What am I missing? Thanks, - xinhuan -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20110208/bfcd1ebb/attachment-0001.html>

...rketing purpose. We build our additional fallback servers as well for fallback relays. We build our customized configuration for Sendmail too. I really need help to figure out if we can continue using Sendmail (even deprecated) for future long term and what implication would be doing so. Thanks, - xinhuan

...my $s = IO::Select->new( $fh ); if ( $io->can_write( 10 ) { # print to the file } It seems like can_write returns true even we manually made file system read only in our testing case. Is this something we can accomplish using select system call with timeout value? Thanks in advance, - Xinhuan Zheng

...://github.com/EarlRamirez/snipeit_iso/blob/master/isolinux/grub.conf file, there is ?@? symbol for splashimage, and for kernel, @KERNELPATH@, @ROOT@, etc. Will those be replaced by actual values? Where do actual values come from? How does actual values substitute those variables? Thanks again, - Xinhuan

...e to use the un-encrypted symmetric key for encryption process. Plus we?ll need to manage the symmetric encryption key, public and private key pair 3 things securely. Has anyone had experience on managing the asymmetric encryption for very large file and what?s the best practice for that? Thanks. - xinhuan

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 generated a 250G data back...

...ense: Additional Sense Code = 25 mtx: Request Sense: Additional Sense Qualifier = 00 mtx: Request Sense: BPV=no mtx: Request Sense: Error in CDB=no mtx: Request Sense: SKSV=no INQUIRY Command Failed On the other server: tape drive (/dev/st0 not even present). Can someone please help? Thanks, - xinhuan

On Fri, March 31, 2017 3:57 pm, Xinhuan Zheng wrote: > Hello, > > Today I searched redhat official portal and learned that Sendmail is > considered deprecated. By default, CentOS 7 will use postfix as MTA. That was an excellent decision I welcomed the day RedHat made it. Beginning with my firat RedHat (it was somewhere aroun...

...ild a server in non-isolated network environment, but for isolated one, we don?t have such a kickstart server. If we had such one, that would mean we consume more resources for building server. What is best way of managing such isolated environment in terms of easily building servers? Thank you, - xinhuan

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 replic...

...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 process? How does boot loader work when VM vs Physical HW has different devices? Thank you, - Xinhuan

...ardware with CentOS 7 without doing machine-to-machine rsync the whole external array data volume? In another words, can I detach external array from old hardware, and attach it to new hardware, then re-configure LVM, so new operating system can recognize the external array file system? Thanks, - Xinhuan

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 d...

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...

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 and >>> those are data backup. Every night the server generated...

...on the system is capable of doing large file support. However, when using ?openssl smime?, it is not able to. Apparently it?s smime method limitations, not the openssl. Other than smime and enc, what other methods can I use for large file support that would use the asymmetric public/private keys? - xinhuan

...data, then use asymmetric >encryption to encrypt only the symmetric key. >GPG takes care of this all internally, so that's what you should be using. Do you have any resources that show examples of how to use GPG internally that takes care of symmetric/asymmetric encryption? Thanks, - xinhuan

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 handl...

Valeri Galtsev wrote: > On 2019-09-25 11:31, Xinhuan Zheng wrote: >> >> 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 > somethi...