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Samba config question
by Robert G. (Doc) Savage 16 Mar '21

16 Mar '21

After setting up /etc/samba/smb.conf and running "testparm" in CentOS 7.9.2011, I have noticed that the list of parameters echoed back for the [global] section do not match those in the smb.conf file. Is this normal? [global] in /etc/samba/smb.conf: unix charset = UTF-8 dos charset = CP932 vfs objs = acl_xattr map acl inherit = yes store dos attributes = yes printing = cups printcap = cups load printers = yes # Network related options workgroup = WORKGROUP server string = Samba Server Version %v netbios name = SERVER01 interfaces = lo eth0 192.168.1.0/24 hosts allow = 127. 192.168.1. # Logging options log file = /var/log/samba/log.%m max log size = 50 # Standalone Server Options security = user passdb backend = tdbsam map to guest = Bad User # Name Resolution wins support = yes dns proxy = yes # Printing options load printers = yes cups options = raw # Filesystem options map archive = no map hidden = no map read only = no map system = no store dos attributes = yes When I subsequently run "testparm", I get a shorter and in some cases different list: [global] in "testparm" output: dos charset = CP932 interfaces = lo eth0 192.168.1.0/24 log file = /var/log/samba/log.%m map to guest = Bad User max log size = 50 printcap name = cups security = USER server string = Samba Server Version %v wins support = Yes idmap config * : backend = tdb cups options = raw hosts allow = 127. 192.168.1 map acl inherit = Yes map archive = No vfs objects = acl_xattr Is this normal behavior for Samba? I am particularly concerned about workgroup = WORKGROUP missing in the "testparm" output. V/R --Doc Savage Fairview Heights, IL

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Re: [CentOS] Bare metal vs. virtualization: Proxmox + Ceph + CentOS?
by Blaž Bogataj 15 Mar '21

15 Mar '21

Hello I'm using ProxMox as virtualization, from verson 2.x. For around 20 servers (most of them are Centos machines) for different services (Zimbra, Apache, MariaDB, PostgreSQL, EDB, ..) and also for MS servers (AD, Exchange, fileserver, MSSql Express, .). They all are running on 5-6 HW servers, different brands and all of them are pretty old. As backup use Synology NAS and nfs with 10gb fc to FC switch. So speed for backup really is not a problem. I slowly moving sata disks to ssd, in same hardware and this is really big advantage in speed. In time of changing disks move virtual machines to other hypervisors. HW Raid5 is really nice with ssd. In 3 years of changing to ssd disks only one fail, but system running and change of disk without downtime ... If I want to test, move, . backup and restore is not an issue. For this year plan is to put one NAS to other location for disaster . ProxMox and software defined storage on 4-5 machines I think for us is the best solution. In point of maintaining there is no problem with upgrading from one release to other - now is version 6.x. Only issue is probably my knowledge how to put this together. All the best Blaz

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Restore mails using Thunderbird
by Nicolas Kovacs 15 Mar '21

15 Mar '21

Hi, One of my clients is running CentOS 7 on his workstation. He's using Mozilla Thunderbird with an IMAP account at Infomaniak to manage his mails. Two days ago he shot himself in the foot by playing around with Thunderbird's auto-cleaning features. He enabled "delete all mails older than 60 days" and managed to wipe most of his 13 GB of archived mails. Fortunately his local network has a local backup server (running CentOS 7 and Rsnapshot), which keeps daily snapshots of his workstation. Thunderbird keeps all configuration and mail in ~/.thunderbird, so I simply renamed this to ~/.thunderbird.bak, searched for the latest correct version of ~/.thunderbird three days ago and restored that. Now here's what happens. 1. When starting Thunderbird all the old mail folders and messages appear correctly. So it looks good. 2. After a few minutes most of the messages disappear. Not good. I don't know exactly what's going on here, but it looks like the server is trying to keep the upper hand here by restoring the last (wrong) state of things. Any suggestions ? Niki -- Microlinux - Solutions informatiques durables 7, place de l'église - 30730 Montpezat Site : https://www.microlinux.fr Blog : https://blog.microlinux.fr Mail : info(a)microlinux.fr Tél. : 04 66 63 10 32 Mob. : 06 51 80 12 12

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remote disk decryption on centos?
by ept8ept8＠secmail.pro 15 Mar '21

15 Mar '21

Hi I was reading about how unlock encrypted root partition from remote (unattended). I'd like asking what is compatible way for this in centos and commonly used by administrators? I think most simple is install dropbear in initramfs for allow remote SSH and manual enter passphrase. I find many HOWTO for that on debian/ubuntu, but nothing for centos. Is there any help, recommend or HOWTO available for centos? Example reference: https://security.stackexchange.com/questions/161974/unattended-disk-encrypt…

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Expand XFS filesystem on CentOS Linux release 8.2.2004 (Core)
by Kaushal Shriyan 14 Mar '21

14 Mar '21

Hi, Is there a way to expand xfs filesystem /dev/nvme0n1p2 which is 7.8G and occupy the remaining free disk space of 60GB? [root@ip-10-0-0-218 centos]# df -hT --total Filesystem Type Size Used Avail Use% Mounted on devtmpfs devtmpfs 1.7G 0 1.7G 0% /dev tmpfs tmpfs 1.7G 0 1.7G 0% /dev/shm tmpfs tmpfs 1.7G 23M 1.7G 2% /run tmpfs tmpfs 1.7G 0 1.7G 0% /sys/fs/cgroup */dev/nvme0n1p2 xfs 7.8G 7.0G 824M 90% /* ----> expand /dev/nvme0n1p2 which is 7.8G and occupy the remaining free disk space of 60GB. /dev/nvme0n1p1 vfat 599M 6.4M 593M 2% /boot/efi tmpfs tmpfs 345M 0 345M 0% /run/user/1000 total - 16G 7.0G 8.5G 46% - [root@ip-10-0-0-218 centos]# fdisk -l GPT PMBR size mismatch (20971519 != 125829119) will be corrected by write. The backup GPT table is not on the end of the device. This problem will be corrected by write. *Disk /dev/nvme0n1: 60 GiB*, 64424509440 bytes, 125829120 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: gpt Disk identifier: E97B9FFA-2C13-474E-A0E4-ABF1572CD20C Device Start End Sectors Size Type /dev/nvme0n1p1 2048 1230847 1228800 600M EFI System /dev/nvme0n1p2 1230848 17512447 16281600 7.8G Linux filesystem /dev/nvme0n1p3 17512448 17514495 2048 1M BIOS boot [root@ip-10-0-0-218 centos]# cat /etc/redhat-release CentOS Linux release 8.2.2004 (Core) [root@ip-10-0-0-218 centos]# Please suggest. Thanks in Advance. Best Regards, Kaushal

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Bare metal vs. virtualization: Proxmox + Ceph + CentOS ?
by Nicolas Kovacs 14 Mar '21

14 Mar '21

Hi, Last week I had a disaster which took me a few unnerving days to repair. My main Internet-facing server is a bare-metal installation with CentOS 7. It hosts four dozen web sites (or web applications) based on WordPress, Dolibarr, OwnCloud, GEPI, and quite a number of mail accounts for ten different domains. On sunday afternoon this machine had a hardware failure and proved to be unrecoverable. The good news is, I always have backups of everything. In that case, I have a dedicated backup server (in a different datacenter in a different country). I’m using Rsnapshot for incremental backups, so I had all data: websites, mail accounts, database dumps, configurations, etc. Now here’s the problem: it took me three and a half days of intense work to restore everything and get everything running again. Three and a half days of downtime is quite a stretch. As far as I understand, my mistake was to use a bare-metal installation and not a virtualized solution where I could simply restore a snapshot of a VM. Correct me if I’m wrong. Now I’m doing a lot of thinking and searching. Proxmox and Ceph look quite promising. From what I can tell, the idea is not to use a big server but a cluster of many small servers, and aggregate them like you would do with hard disks in a RAID 10 array for example, only you would do this for the whole system. And then install one or several CentOS 7 VMs on top of this setup. Any advice from the pros before I dive head first into the documentation? Cheers from the sunny South of France, Niki -- Microlinux - Solutions informatiques durables 7, place de l'église - 30730 Montpezat Site : https://www.microlinux.fr Blog : https://blog.microlinux.fr Mail : info(a)microlinux.fr Tél. : 04 66 63 10 32 Mob. : 06 51 80 12 12

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Re: [CentOS] Dual WAN on EL8 desktop.
by Gordon Messmer 14 Mar '21

14 Mar '21

On Mon, Feb 15, 2021 at 10:30 PM Thomas Stephen Lee <lee.iitb(a)gmail.com> wrote: > What is ideal is the bandwidth of two connections and half bandwidth > when one link is down. That may not be *generally* possible. You can load-balance your network streams (connections), so that you'll utilize the bandwidth of two physical links in sum, but each individual network stream is going to traverse just one physical link, and will never be faster than whichever link is selected for that stream when it is initiated.

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Re: [CentOS] Dual WAN on EL8 desktop.
by Thomas Stephen Lee 12 Mar '21

12 Mar '21

On Wed, Feb 17, 2021 at 2:04 AM Kenneth Porter <shiva(a)sewingwitch.com> wrote: > > --On Tuesday, February 16, 2021 12:00 PM +0530 Thomas Stephen Lee > <lee.iitb(a)gmail.com> wrote: > > > The solution should be a software one without acquiring new hardware. > > What is ideal is the bandwidth of two connections and half bandwidth > > when one link is down. > > The search term you're looking for is "NIC bonding". Here's the first hit I > get from Google: > > <https://www.enterprisenetworkingplanet.com/linux_unix/article.php/3850636/U…> > Hi, I tried https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/ht… without success I have a feeling that bonding is for interfaces on the same network, not two internet routers. Please correct me if I'm wrong. --- Lee

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Disk read io very high, but no process perform io read
by yf chu 12 Mar '21

12 Mar '21

We have experienced a very weird problem. The load of the server machine is very high. We use "pidstat" and find that the disk read io is very high. But the processes running on this server do not perform any disk read operation. We also noticed that when we execute "top" command, for most of processes, the values in "SHR" column are zero. Compared with other normal servers, we found that by executing "free -m", the result shows that the buff/cache value in this server is lower than the value of other normal servers. We also found that there were lots of major page faults by executing "ps -o majflt,minflt". Swap is not enabled on this server. What could be the reason for this issue? The centos version:CentOS Linux release 7.3.1611 kernel version:3.10.0-693.21.1.std7a.el7.0.x86_64

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R730xd & SD card identfication
by Gregory P. Ennis 10 Mar '21

10 Mar '21

Everyone, We have migrated a platform to a Centos 8 host using kvm guest machines Recently I tried to copy one of the guests to the external SD card on the back of the Dell R730xd, but I have not been able to get the Centos 8 host to recognize the SD card. I can use DRAC interface of the R730xd to see that the SD card is being recognized and the status of the external SD slot is turned from inactive to active when the card is inserted. I have used lsblk, fdisk -l, and 'dmesg | tail' none of which demonstrate that the Centos 8 host is recognizing the SD card. You help would be appreciated. Thanks !! -- Greg Ennis

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