Re: [CentOS] Find out which process consumed Network bandwidth
On 9/13/21 18:47, MRob wrote: While you probably can't recover such information for past events, going forward, iptables can help you figure this out. Putting an IPtables rule in the OUTPUT table prior to ACCEPTing the packets can help, e.g.: iptables -A OUTPUT -p tcp -m owner --uid-owner nginx -j ACCEPT OUTPUT and "-m owner" are only going to work for outgoing connections, initiated by nginx, which probably isn't much for most systems that aren't reverse proxies. Most of the time, if you want iptables to track the amount of traffic for a specific service, you'll need one or more rules inserted at the beginning of the INPUT chain, before the typical first rule that allows RELATED and ESTABLISHED packets. You could have one rule that allows all traffic to the service port (a stateless rule), or you could have one rule that allows ESTABLISHED traffic to the service port and one that allows NEW,UNTRACKED traffic to the port (stateful rules) That is nice solution! Why do you add a new output rule rather you can look at the existing port rule: # iptables -v -L | grep https xxx yyy ACCEPT tcp -- any any anywhere anywhere tcp dpt:https ctstate NEW,UNTRACKED xxx is number packets, yyy is number bytes. If adding OUTPUT rule, what is gained? Because the rule you're looking at only matches NEW and UNTRACKED packets, so it's usually only a record of the TCP SYN packets that initiated connections. If you want a byte count of the traffic for that service, this rule won't provide that. The nginx logs are the most detailed and usually the most useful record of traffic used, but accounting through iptables is also an option. Though, if you're interested in the sort of less detailed logs that you'll get from iptables, then I'd suggest what you want might be NetFlow data: https://www.linuxnetflow.com/ ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
[CentOS] Connecting an android tablet to CentOS
I plug it in via usb, and I see mtp... but it sees it as a camera for some reason. Clue? Meanwhile, they seem to have updated android to make things less accessable, meaning I can't find the kindle books I bought, as I could a few months ago. mark ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Find out which process consumed Network bandwidth
See "man iptables-extensions" and "man iptables". I don't know how this works with firewall-cmd, but I imagine firewalld "just" manages iptables? Yes thats right I am running CentOS Linux release 7.9.2009 (Core). Is there a way to find out which process consumed network bandwidth during a specific time period? For example, the Nginx process consumed how much network traffic on Sept 01, 2021. As far as I know, such accounting isn't done in a standard CentOS system, so there's no way to determine such information about a past event While you probably can't recover such information for past events, going forward, iptables can help you figure this out. Putting an IPtables rule in the OUTPUT table prior to ACCEPTing the packets can help, e.g.: iptables -A OUTPUT -p tcp -m owner --uid-owner nginx -j ACCEPT because now "iptables -L" will display a count of the packets that matched each rule and the number of bytes. By comparing with the total packets and bytes for a given time period, you can work out the share for nginx. You can also estimate packet and byte counts by IP and port using this method. You could run an hourly cronjob to log the stats. That is nice solution! Why do you add a new output rule rather you can look at the existing port rule: # iptables -v -L | grep https xxx yyy ACCEPT tcp -- anyany anywhere anywhere tcp dpt:https ctstate NEW,UNTRACKED xxx is number packets, yyy is number bytes. If adding OUTPUT rule, what is gained? ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Find out which process consumed Network bandwidth
On Mon, 6 Sept 2021 at 14:24, Anand Buddhdev On 06/09/2021 19:35, Kaushal Shriyan wrote: Hi Kaushal, I am running CentOS Linux release 7.9.2009 (Core). Is there a way to find out which process consumed network bandwidth during a specific time period? For example, the Nginx process consumed how much network traffic on Sept 01, 2021. As far as I know, such accounting isn't done in a standard CentOS system, so there's no way to determine such information about a past event Kaushal, While you probably can't recover such information for past events, going forward, iptables can help you figure this out. Putting an IPtables rule in the OUTPUT table prior to ACCEPTing the packets can help, e.g.: iptables -A OUTPUT -p tcp -m owner --uid-owner nginx -j ACCEPT because now "iptables -L" will display a count of the packets that matched each rule and the number of bytes. By comparing with the total packets and bytes for a given time period, you can work out the share for nginx. You can also estimate packet and byte counts by IP and port using this method. You could run an hourly cronjob to log the stats. See "man iptables-extensions" and "man iptables". I don't know how this works with firewall-cmd, but I imagine firewalld "just" manages iptables? Good luck! ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
[CentOS] How to keep audio active?
Hi, how can I keep audio active --- or at least make it come back right away --- after there was no audio for a few seconds? It takes some seconds for the audio to come back, like when a movie was paused and playback is being resumed. I either have to scroll back or miss out on the audio, and that's totally annoying. It also means that I can't hear any notifications because the notification has finished playing long before the audio is back. I tried options snd-hda-intel power_save=0 pm_blacklist=1 power_save_controller=0 in /etc/modprobe.d/snd_hda_intel.conf, and it didn't change anything. Audio comes from an NVIDIA card connected to a display port. Disabling power management of the audio controller on the card didn't help, either. All applications playing audio are affected. ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
