I need to build a dual cpu system with AMD EPYC-9754, and need to buy two CPUs of this type.
As we know, there are two different version of 9654, i.e. 9654P and 9654, where the former for single socket and the other for dual sockets respectively.
I can't search any information about 9754P. Is it meanning that there's no "P" version of 9754? If I buy two 9754s, and plug them into a same Gigabyte MZ73-LM1 motherboard, will they work?
Thanks!!!
I have a daemon service application runing a Ubuntu server(20.04.1). The total phisical memory is 2G, and the swap space is 4G.
Sometime my service was killed by OS quietly, eventhough I add OOMScoreAdjust=-1000 into my systemd service descripting file at /etc/systemd/system/, but it is a critical app should NOT be killed.
I guess that the reason why it be killed maybe is it used too more memory.
I need to get detail logs about the memory usage of my service, for example, a log entry every minute, so that I can fingure out the max value of that, and adjust the requirements of others services such as postgresql.
It is a daemon app and running a cloud VPS, so I can NOT start a top command and be watching it continuously.
Is there a way, in which I can generate such a log?
Thanks!
In my OpenWrt box, I want to route only a specific protocol(tcp:1888) to a tun interface only for one PC(192.168.28.2), so I do as following:
ip rule add from 192.168.28.2 dport 1888 lookup 123
ip route add default via 10.8.0.2 dev tun0 table 123
But it does NOT work!
When I check the rule list with ip rule, I get:
0: from all lookup local
32765: from 192.168.28.2 lookup 123
32766: from all lookup main
32767: from all lookup default
I guest that the dport SELECTOR doesn't take effect.
How should I do?
Thanks!!!
Solution: With Nikita Kipriyanov's help, I got it, but the FORWARD chain of mangle table doesn't work, I used the PREROUTING instaed.
Would pls anyone explain why should I use PREROUTING instead of FORWARD of mangle?
I often see that there are some stateful matching rules in a iptables' chain such as INPUT.
I known what they are doing, and I'm interested in that
Should I do the same for the chains of the table NAT?
For example, in my home router, I want it accepts ssh, and also acts as a NAT router.
If we have:
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT
should I do follows for better performance?
-t nat -A POSTROUTING -m state --state RELATED,ESTABLISHED -j MASQUERADE
-t nat -A POSTROUTING -s 192.168.1.0/24 -o wan0 -m state --state NEW -j MASQUERADE
I guess that I should NOT do the same for the POSTROUTING chain, but should for the FORWARD.
Thanks!
I have run a program that writes a lot of log files in a lot of directories. For example, there are hundreds directories, and every one includes thousands of log files. I need to find out the files those include the keywords "WARNN", "ERROR" and "FATAL" in command-line shell. I tried to use "grep WARRN */*", but I got "-bash: /usr/bin/grep: Argument list too long".
Would any good man please tell me a method? Any reply or hint will be much aprreciated!
Every time if I put a file into the doc dir of nginx by using the mv command, it always results in a 403 Forbidden error, but if I do that by using the cp command, no error occurs.
I tried very large and very small files, and tried putting files whether or not nginx is alive, and tried clearing the cache dir of nginx, but the problem still raised.
Has someone resolved a problem like this?
I'm trying to install MPTCP(Multi-Path TCP) enabled kernel and tools on a CentOS7 box according to the installation doc. It needs 3 rpm packages to be installed. I encounter a trouble when I installing iproute-mptcp_v0.94.
[root@c7builder tmp]# yum install iproute-mptcp_v0.94
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* epel: mirrors.yun-idc.com
* extras: mirrors.aliyun.com
* updates: mirrors.huaweicloud.com
Package iproute is obsoleted by iproute-tc, trying to install iproute-tc-mptcp_v0.94-5.fc24.x86_64 instead
Resolving Dependencies
--> Running transaction check
---> Package iproute-tc.x86_64 0:mptcp_v0.94-5.fc24 will be installed
--> Processing Dependency: iproute(x86-64) = mptcp_v0.94-5.fc24 for package: iproute-tc-mptcp_v0.94-5.fc24.x86_64
--> Finished Dependency Resolution
Error: Package: iproute-tc-mptcp_v0.94-5.fc24.x86_64 (bintray-cpaasch-rpm)
Requires: iproute(x86-64) = mptcp_v0.94-5.fc24
Installed: iproute-4.11.0-14.el7.x86_64 (@anaconda)
iproute(x86-64) = 4.11.0-14.el7
Available: iproute-mptcp_v0.91-4.fc24.x86_64 (bintray-cpaasch-rpm)
iproute(x86-64) = mptcp_v0.91-4.fc24
Available: iproute-mptcp_v0.92-4.fc24.x86_64 (bintray-cpaasch-rpm)
iproute(x86-64) = mptcp_v0.92-4.fc24
Available: iproute-mptcp_v0.93-4.fc24.x86_64 (bintray-cpaasch-rpm)
iproute(x86-64) = mptcp_v0.93-4.fc24
Available: iproute-mptcp_v0.94-5.fc24.x86_64 (bintray-cpaasch-rpm)
iproute(x86-64) = mptcp_v0.94-5.fc24
Available: iproute-4.11.0-14.el7_6.2.x86_64 (updates)
iproute(x86-64) = 4.11.0-14.el7_6.2
You could try using --skip-broken to work around the problem
You could try running: rpm -Va --nofiles --nodigest
It looks like that "iproute-mptcp_v0.94" needs "iproute-tc-mptcp_v0.94" to be installed first, but "iproute-tc-mptcp_v0.94" either needs former! I'm confused with this. Would anybody like explain this for me?
Before I install gcc-8.3.0, I take a snapshot of the root("/") LV as following command:
lvcreate -L 20G -s vgsys/lvroot -n lvroot_gcc7
Then, I installed gcc-8.3.0, and taked another snapshot of the root LV as following:
lvcreate -L 25G -s vgsys/lvroot -n lvroot_gcc8
Now, my system looks like that:
root# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
lvhome vgsys -wi-ao---- 80.00g
lvroot vgsys owi-aos--- 64.00g
lvroot_gcc7 vgsys swi-a-s--- 20.00g lvroot 5.26
lvroot_gcc8 vgsys swi-a-s--- 25.00g lvroot 0.00
After I used this system for a while, I found that the Using-Percentage(Data%) of lvroot_gcc7 is changing continuously same as lvroot_gcc8!
Now, this is the status of my system:
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
lvhome vgsys -wi-ao---- 80.00g
lvroot vgsys owi-aos--- 64.00g
lvroot_gcc7 vgsys swi-a-s--- 20.00g lvroot 6.05
lvroot_gcc8 vgsys swi-a-s--- 25.00g lvroot 0.86
BTW, every time before I taking a snapshots, I would reboot the system with a Kubuntu 18.04.2 installation medium USB-stick, and take snapshots of lvroot always when it was not mounted.
Why the lvroot_gcc7 is still changing after the lvroot_gcc8 has been created?
As my comprehension, after I created the 1st snapshot of lvroot, before the 2nd one, if the data in lvroot is about to be over-written, it would be first read out and written to the 1st snapshot. But after I created the 2nd snapshot, the data about to be over-written should be read out and written to the 2nd snapshot ONLY, unless the 2nd snapshot is invalid or out of space, the old data would be copied to the 1st snapshot instead. This is the way how LVM systems trace the changes of LVs. Many snapshots of same original LV compose a link in this way. If my comprehension is right, the 1st snapshot had been frozen after the 2nd snapshot had been created, so that there should not be any writing operation occured to the 1st one if the 2nd one has enough free space for tracing the changes to lvroot, and the used size of the 1st one should NOT be changing continuously.
I am using OpenVPN-2.4.6 clients and an OpenVPN-2.4.5 server that resides an OpenWRT(18.06.01) router.
The OVPN client connects to the server by a public DNS name of the server(i.e pubName.my.router), instead of an ip since the ip of the server is dynamic.
Can I(and how to) add a local domain entry of the server(i.e privateName.in.vpn) to the resolver of the clients?
Because OpenVPN would resolve and cache the ip of pubName.my.router before it starts connecting, I believe that the local entry added later will not disturb the traffic of OVPN own.
Basically, I think I have three questions:
Any suggestions or hints will be appreciated! Pls mercy a Chinese writing such an ugly English post, I wish I have expressed things correctly. Thank you anyway!