Discuss June 2020

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103 participants
90 discussions

fdisk boot partition
by Jerry Geis 01 Jul '20

01 Jul '20

I am trying to use CentOS 8 host to boot an image (OS X) that I created using dd. First I tried fdisk -l image_file.img - all looks good so I did fdisk image_file.img - this works - but seems in CentOS 8 fdisk there is no longer a toggle bootable flag option. How do I do that ? Thanks, Jerry

4 3

what's the advantage of NetworkManager for server?
by d tbsky 01 Jul '20

01 Jul '20

Hi: I always use network-scripts to start network at EL7. NetworkManager is not as good as network scripts under that OS. but now EL8 said that network-scripts is depreciated. I wonder if I should still use network-scripts to start network? I am afraid there will be new bugs for the network-scripts, like systemd service unit dependency. although it is solid at EL7.

4 4

krb5 update => Database module does not match KDC version
by lejeczek 30 Jun '20

30 Jun '20

Hi everybody As a word of caution - make sure you are prepared for some trouble when upgrading krb5 packages to version 1.18.2-2.el8. FreeIPA brakes with: ...krb5kdc[554972](Error): Database module does not match KDC version - while initializing database for realm XX.YY

1 0

Unable to find the used space
by Sachchidanand Upadhyay 30 Jun '20

30 Jun '20

Hi, While checking with df -h, it's showing the used space is 94% on root (/). If checked with du -sh, it's not showing the used space. # df -h Filesystem Size Used Avail Use% Mounted on devtmpfs 7.8G 0 7.8G 0% /dev tmpfs 7.8G 0 7.8G 0% /dev/shm tmpfs 7.8G 857M 7.0G 11% /run tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup /dev/mapper/centos-root 50G 47G 3.4G 94% / /dev/mapper/centos-home 241G 47G 195G 20% /var/log /dev/sda1 1014M 189M 826M 19% /boot tmpfs 1.6G 0 1.6G 0% /run/user/0 tmpfs 1.6G 0 1.6G 0% /run/user/1002 # du -sh /* 0 /bin 156M /boot 0 /dev 33M /etc 388K /home 0 /lib 0 /lib64 0 /media 0 /mnt 0 /opt du: cannot access ‘/proc/21489/task/21489/fd/4’: No such file or directory du: cannot access ‘/proc/21489/task/21489/fdinfo/4’: No such file or directory du: cannot access ‘/proc/21489/fd/4’: No such file or directory du: cannot access ‘/proc/21489/fdinfo/4’: No such file or directory 0 /proc 6.1M /root 857M /run 0 /sbin 0 /srv 0 /sys 0 /tmp 2.8G /usr 62G /var # du -sh /var/* 0 /var/adm 89M /var/cache 0 /var/crash 8.0K /var/db 0 /var/empty 0 /var/games 0 /var/gopher 0 /var/kerberos 16G /var/lib 0 /var/local 0 /var/lock 47G /var/log 0 /var/mail 0 /var/nis 0 /var/opt 0 /var/preserve 0 /var/run 98M /var/spool 0 /var/tmp 499M /var/www 0 /var/yp How can i find this hidden space? -- BR, Sachchidanand

7 6

CentOS 7 system running out of available memory, then unusable, network interfaces probably involved
by wwp 30 Jun '20

30 Jun '20

Hello, my CentOS 7 system goes unstable after few days of use, memory consumption growing and never getting freed, until the system slows down to hell (swapping), kills apps, and eventually freezes or reboots itself. This only happens when I have two network interfaces turned on, one wired and one wireless, each to different routers. The hardware: a Dell Precision 7530, SSD, 16GB RAM. HW memory and disk both tested OK by software. According to lspci: 00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (7) I219-LM (rev 10) 6e:00.0 Network controller: Intel Corporation Wireless-AC 9260 (rev 29) The software: I keep this CentOS 7 system up-to-date with the CR repo, excepted the microcode_ctl package, stuck to few versions back (updating it kills the system and potentially causes fs damages). Kernels reproducing the issue (IOW, all): kernel-3.10.0-1062.18.1.el7.x86_64 kernel-3.10.0-1127.el7.x86_64 kernel-3.10.0-1127.8.2.el7.x86_64 kernel-3.10.0-1127.13.1.el7.x86_64 Nothing jumps to my eyes looking at /var/log/messages but this, many occurrences: kernel: nf_conntrack: falling back to vmalloc. I searched the Internet for it, and the few results I found were not bringing any solution and were quite pessimistic WRT to memory freeing, am I wrong? Regards, -- wwp https://useplaintext.email/

2 2

Adding root CA certificates for use by NSS applications?
by James Pearson 29 Jun '20

29 Jun '20

I'm trying to get a third party application to use the root CA certificate of an SSL proxy - but can't work out how to install the cert for use by all users on CentOS 7 I have the proxy vendor's supplied CA cert in PEM format I can install the cert in a user's home directory using 'certutil' - and the application works OK - but I would like to do 'something' to install this cert somewhere central that will be picked up by all users After a bit of Googling, I've found that by default, EL7 uses 'p11-kit-trust.so' (from the p11-kit-trust package) as a drop-in replacement for the nss supplied 'libnssckbi.so' (via 'alternatives') - which, I believe, should be able to pick up CA certs installed under /etc/pki/ca-trust/source/anchors/ Strace'ing the app, I can see it reading the files under /etc/pki/ca-trust/source/... including the required CA cert - but the app fails to connect - but I have no idea what might be wrong ... Am I missing something obvious here? Is there an easier way to achieve what I want? Thanks James Pearson

1 0

No samba-vfs-glusterfs package
by Strahil Nikolov 29 Jun '20

29 Jun '20

Hello Community, does anyone know if we got samba-vfs-glusterfs package available and if yes, in which repo ? On CentOS7 it was part of the base repo , but I can't find it. Thanks in advance. Best Regards, Strahil Nikolov

1 0

CentOS 8 - Fail to mount ${HOME}
by Yair Garfinkel 29 Jun '20

29 Jun '20

Hi, We have a large amount of CentOS 7 here and when a user logs in to any of them, his home directory is mounted of the network. When we tried to do this with CentOS 8, the user logs in but his home directory was created locally on the machine. - I have already disables this "nice" feature by running: [root@lab_cnt08 ~]# *authconfig --disablemkhomedir --update* - Both CentOS 7 and CentOS 8 machines reside in the same domain. Any thoughts or ideas would be appreciated. Thanks, *Yair Garfinkel*

1 0

Port forward internal host not working
by Rudi Ahlers 28 Jun '20

28 Jun '20

Hi, I am trying to reach a Raspberry Pi on my physical LAN (192.168.10.132), via OpenVPN, from the internet. The Internet host is 154.77.x.x. This is also the OpenVPN router, 10.8.0.1. The Pi is on 10.8.0.203. I am trying to reach port 3000 from the internet. >From the CentOS 7 server, I can access the Pi over OpenVPN: root@ns1:[~]$ telnet 10.8.0.203 3000 Trying 10.8.0.203... Connected to 10.8.0.203. Escape character is '^]'. But from the host IP, I cannot get it to connect: root@ns1:[~]$ telnet 154.77.x.x 3000 Trying 154.77.x.x .. telnet: connect to address 154.77.x.x: Connection timed out I have tried a few different iptables rules, but simply cannot get it working. As example: iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE iptables -A INPUT -i tun+ -j ACCEPT iptables -A FORWARD -i tun+ -j ACCEPT iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 8081 -j DNAT --to 10.8.0.202:8081 iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 3000 -j DNAT --to 10.8.0.203:3000 iptables -A FORWARD -i eth0 -p tcp --dport 8081 -d 10.8.0.202 -j ACCEPT iptables -A FORWARD -i eth0 -p tcp --dport 3000 -d 10.8.0.203 -j ACCEPT iptables -A FORWARD -i tun+ -o eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT iptables -A FORWARD -i eth0 -o tun+ -m state --state RELATED,ESTABLISHED -j ACCEPT -- Kind Regards Rudi Ahlers Website: http://www.rudiahlers.co.za

1 0

Optimizing Windows virtual machines
by Georgios 28 Jun '20

28 Jun '20

Hi! Im following the instructions found on RHEL 8 documentation. https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/ht… And when I'm trying to pass the command sudo virt-xml Windows10 --edit --features hyperv_relaxed=on,hyperv_vapic=on,hyperv_spinlocks=on,hyperv_spinlocks_ retries=8191,hyperv_vpindex=on,hyperv_runtime=on,hyperv_synic=on,hyperv _stimer=on,hyperv_frequencies=on I get the following error. ERROR Unknown --features options: ['hyperv_vpindex', 'hyperv_runtime', 'hyperv_stimer', 'hyperv_frequencies'] I can manually add the options on the xml file but i was wondering if the feature arguments are removed and they have no effect or if I'm missing something. Thanks in advance ps.Im running centos 8.1 since 8.2. broke my wifi.

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Discuss June 2020