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Teo En Ming's Learning Achievements on 14 August 2020 Friday
by Turritopsis Dohrnii Teo En Ming 15 Aug '20

15 Aug '20

Subject: Teo En Ming's Learning Achievements on 14 August 2020 Friday [1] Activate Cisco AnyConnect SSL VPN License on Cisco ASA 5506-X Firewall Today I discovered that the base license for Cisco ASA 5506-X Firewall only allows maximum 2 SSL VPN users. I had to login to https://www.cisco.com/go/license, assign the PAK/token to the serial number of Cisco ASA 5506-X firewall and perform a license request to Cisco. After receiving the Product Authorization Key from Cisco, I had to activate it on the Cisco ASA 5506-X firewall using the following CLI commands: enable config t activation-key 12345678 12345678 12345678 12345678 12345678 The number of AnyConnect Premium Peers has been increased from 2 to 50 after license activation. [2] Configuring NIC teaming/bonding on CentOS 8.2 (2004) Linux Server Today I had to configure NIC teaming/bonding on CentOS 8.2 (2004) Linux Server. The server hardware is Dell PowerEdge R640 with 2x 10GE NIC ports and 6x 1GE NIC ports. NIC teaming/bonding was configured using 2x 10GE NIC ports. All I had to do is to follow the following reference guide. Reference Guide: How to Configure NIC Teaming on CentOS 8 / RHEL 8 Link: https://www.linuxtechi.com/configure-nic-teaming-centos-8-rhel-8/ In my situation, the network interfaces used in the NIC teaming/bonding are eno1 and eno2. Both are 10 Gigabit per second. -- -----BEGIN EMAIL SIGNATURE----- The Gospel for all Targeted Individuals (TIs): [The New York Times] Microwave Weapons Are Prime Suspect in Ills of U.S. Embassy Workers Link: https://www.nytimes.com/2018/09/01/science/sonic-attack-cuba-microwave.html ******************************************************************************************** Singaporean Mr. Turritopsis Dohrnii Teo En Ming's Academic Qualifications as at 14 Feb 2019 and refugee seeking attempts at the United Nations Refugee Agency Bangkok (21 Mar 2017), in Taiwan (5 Aug 2019) and Australia (25 Dec 2019 to 9 Jan 2020): [1] https://tdtemcerts.wordpress.com/ [2] https://tdtemcerts.blogspot.sg/ [3] https://www.scribd.com/user/270125049/Teo-En-Ming -----END EMAIL SIGNATURE-----

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Dumb Centos 8 DNF mirror question...
by Tom Bishop 14 Aug '20

14 Aug '20

I have several Centos 8 machines that I update and every now and again I will go through and update all of them and one of them will get a slow mirror, like downloading the kernel at 50kb etc. With the newer version I am unable to figure out how to force it to update the mirror list and hopefully change to a faster mirror. I have searched but must not be using the right verbiage since I am unable to find the easy solution to dump the mirrors and re-select. Thanks :)

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After update to 8 (2004) ... system is unbootable - UEFI Secure boot
by Leon Fauster 13 Aug '20

13 Aug '20

Hi all, I updated a Dell XPS laptop from CentOS 8.1 (1911) to 8.2 (2004). Installed kernels are kernel-4.18.0-147.5.1.el8_1.x86_64 kernel-4.18.0-147.8.1.el8_1.x86_64 kernel-4.18.0-193.6.3.el8_2.x86_64 Unfortunately I can not boot into the latest kernel-4.18.0-193.6.3.el8_2.x86_64. After grub2 screen I only see following line: EFI stub: UEFI Secure Boot is enabled Booting into the older kernel is still possible. The above line appears and after that the normal kernel output scrolls over the screen (rhgb quiet disabled). Is the new kernel correctly signed? What can I do? -- Thanks Leon

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kvm & external snapshots
by Gregory P. Ennis 13 Aug '20

13 Aug '20

Everyone, I am trying to create external snapshots of a kvm guest machine and have not been able to do so. In accordance with : https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/ht… I have used the command line : snapshot-create-as --diskspec vda,snapshot=external,file=/u4/guest/MaBa- clone/test.snap.img--domain MaBa-clone --name MaBa-clone_snap --description "Snap before 9Aug2020" This command line gives me the error : error: unsupported configuration: disk 'vda' must use snapshot mode 'internal' Is it possible to perform an external snapshot of a kvm guest? Greg Ennis

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[Sharing] CentOS 8.2 (2004) Linux Server is Compatible with Dell PowerEdge R640 1U Server
by Turritopsis Dohrnii Teo En Ming 13 Aug '20

13 Aug '20

Subject: [Sharing] CentOS 8.2 (2004) Linux Server is Compatible with Dell PowerEdge R640 1U Server Good day from Singapore, I have just installed CentOS 8.2 (2004) Linux Server on Dell PowerEdge R640 1U Server for "Donald Trump and Xi Jinping Investment Company LLP" (fictitious/fictional company name used) in Singapore on 11 August 2020 Tuesday. I can confirm that CentOS 8.2 (2004) is compatible with Dell PowerEdge R640. The hardware specifications of Dell PowerEdge R640 are: (1) Processor: Intel Xeon Silver 4210R CPU @ 2.40 GHz (10 cores, 20 threads) (2) 128 GB DDR4-2400 RAM (8 pieces of 16 GB RAM, all 8 slots filled up) (3) PERC H740P Mini RAID Controller (4) 2 units of 960 GB SATA 6 Gbps SSD in RAID 1 configuration (5) Network Ports: 4 x 1 GbE 2 x 10 GbE + 2 x 1 GbE Just sharing only. -- -----BEGIN EMAIL SIGNATURE----- The Gospel for all Targeted Individuals (TIs): [The New York Times] Microwave Weapons Are Prime Suspect in Ills of U.S. Embassy Workers Link: https://www.nytimes.com/2018/09/01/science/sonic-attack-cuba-microwave.html ******************************************************************************************** Singaporean Mr. Turritopsis Dohrnii Teo En Ming's Academic Qualifications as at 14 Feb 2019 and refugee seeking attempts at the United Nations Refugee Agency Bangkok (21 Mar 2017), in Taiwan (5 Aug 2019) and Australia (25 Dec 2019 to 9 Jan 2020): [1] https://tdtemcerts.wordpress.com/ [2] https://tdtemcerts.blogspot.sg/ [3] https://www.scribd.com/user/270125049/Teo-En-Ming -----END EMAIL SIGNATURE-----

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Testing
by Turritopsis Dohrnii Teo En Ming 13 Aug '20

13 Aug '20

Testing

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Docker swarm service misconfigured in FirewallD / CentOS 7
by Nicolas Kovacs 13 Aug '20

13 Aug '20

Hi, I'm currently fiddling with Docker Swarm on three sandbox servers running CentOS 7. Unfortunately I couldn't get even the most basic configuration running. After some experimenting and investigating, it turns out there's a problem with FirewallD. Here's what I did first on every single node. # firewall-cmd --permanent --add-service=docker-swarm # firewall-cmd --reload I launched a simple web service like this: # docker service create --name web -p 80:80 nginx My three nodes appear correctly with 'docker node ls'. >From here, I should be able to open the Nginx default web page in a web browser using any node's hostname. But nothing happens. No page is loaded. On a whim, I turned off FirewallD, and suddenly everything worked as expected. Now here's the list of ports that have to be open on every single node for Docker Swarm to work: * 2376/tcp * 2377/tcp * 7946/tcp * 7946/udp * 4789/udp And here's what docker-swarm.xml looks like under CentOS 7: # cat /usr/lib/firewalld/services/docker-swarm.xml <?xml version="1.0" encoding="utf-8"?> <service> <short>Docker integrated swarm mode</short> <description>Natively managed cluster of Docker Engines (>=1.12.0), where you deploy services.</description> <port port="2377" protocol="tcp"/> <port port="7946" protocol="tcp"/> <port port="7946" protocol="udp"/> <port port="4789" protocol="udp"/> <protocol value="esp"/> </service> So it looks like TCP port 2376 was forgotten in that service definition. I opened it up manually on every node: # firewall-cmd --permanent --add-port=2376/tcp # firewall-cmd --reload And now Docker Swarm works correctly. Cheers from the sunny South of France, Niki Kovacs -- 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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NFSroot over wifi in CentOS 7 - graceful shutdown problem
by Dmitry E. Mikhailov 13 Aug '20

13 Aug '20

Hi, I've got a task to have a small number of laptops netboot Linux over WiFi. The kernel is loaded off the USB stick of cource, it's off topic for now. The WPA-supplicant daemon is started early by dracut off initrd. It works. Mostly. The problem is that upon shutdown systemd terminates all the processes FIRST and unmounts filesystems NEXT. Guess what? Upon termination, wpa-supplicant brings the wireless interface down and the system hangs being unable to unmount now-defunct NFSroot. There were some discussions regarding similar matter and there's even the RH Errata: https://access.redhat.com/errata/RHBA-2018:2447 But I'm woking on a fully updated CentOS Linux release 7.8.2003 and nevertheless I've got the problem. I don't have rights to see the BZ. https://bugzilla.redhat.com/show_bug.cgi?id=1593649 I'm deciding to use a quick and dirty hack to do a totally ungraceful shutdown/reboot: https://unix.stackexchange.com/questions/533307/systemd-fails-to-umount-man… Any better ideas? Best regards, Dmitry Mikhailov.

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Install OpenVAS on CentOS Linux release 8.2.2004 (Core)
by Kaushal Shriyan 12 Aug '20

12 Aug '20

Hi, I am running CentOS Linux release 8.2.2004 (Core). Are there any instructions to install OpenVAS for CentOS Linux release 8.2.2004 (Core)? Thanks in advance and I look forward to hearing from you. Best Regards, Kaushal

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Re: [CentOS] systemd syslog.target
by ctcard 11 Aug '20

11 Aug '20

Thanks Simon,I think my question got a bit lost amongst all the grub issues - does anyone else have information about whether any references to syslog.target in systemd unit files can be removed?ChrisSent from Samsung Mobile on O2 -------- Original message -------- From: Simon Matter via CentOS <centos(a)centos.org> Date: 31/07/2020 10:02 (GMT+00:00) To: CentOS mailing list <centos(a)centos.org> Subject: Re: [CentOS] systemd syslog.target Hi,>> I've noticed that there are several systemd unit files in CentOS 7 and 8> with the optionAfter=syslog.targetin the [Unit] section, but since systemd> version 198 syslog.target has not existed.I deduce from this that> "After=syslog.target" is ignored by systemd and can therefore be removed.> Is this correct? I am writing some systemd unit files for our own services> which previously used init.d scripts, so I want to ensure I'm not causing> problems by omitting "After=syslog.target"ChrisSent from Samsung Mobile on> O2Interesting, there is really no syslog.target on either CentOS 7 or 8. Butif a service needs classic syslog, shouldn't it have another After=instead?Simon_______________________________________________CentOS mailing listCentOS@centos.orghttps://lists.centos.org/mailman/listinfo/centos

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