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Questions tagged [proc]

/proc filesystem related questions

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can't ping my own IP address (interface with multiple IP Addresses)

I have a server where one of its interfaces (eth2), has multiple IP addresses: $ ip addr show 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default link/loopback 00:...
9
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1answer
896 views

A quick way to check the type of the drive

Is there a quick way to understand a type of the "storage" on Linux? Is it a HDD or SSD (or NVMe)? It's already known that the host is a physical machine and not a VM. The first thing I though about ...
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1answer
62 views

how are all/default/interface configuration influencing each other?

On the following kernel configuration path: /proc/sys/net/ipv6/conf/ we can configure each network interface in the following way: we can specify what configuration to follow for all interfaces we ...
2
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1answer
60 views

sysctl vs writing directly to /proc/*

On a typical linux machine you can change kernel configuration by modifying the files located at /proc/*. For example, for the IPv6 accept_dad parameter of a specific network interface (say, eth0), ...
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0answers
25 views

using custom core_pattern, core filename gets cut off after certain number of characters

I've set the /proc/sys/kernel/core_pattern to: core.%e Using %e indicates the filename of the crashed process. In our case, our binaries are named as the full URL in which they were downloaded from (...
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2answers
126 views

/proc/sys/net/netfilter/nf_conntrack_count extreme drop when reading /proc/net/nf_conntrack

I have very busy Web servers, and wanted to introduce some analysis to see what kind of traffic present. Namely, total number of all connections, number of time waits, established connections, udp and ...
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0answers
112 views

how to find network bandwidth usage per process and systemwide usage?

How can i find network bandwidth usage per process as well as systemwide usage without installing third party packages like iftop, nethogs or iptraf I went through /proc//net/xxx but didnt get clear ...
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0answers
43 views

Getting GPU statistics from /proc (ubuntu)

I am trying to get load statistics from my GPUs (NVIDIA). Is there a place in the /proc file system where I could find something useful, akin to /proc/stat to get CPU info? I know there are command ...
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63 views

Understanding some of my linux process file descriptors

Looking to some of my production processes, I realize that I can't understand what exactly some of its file descriptors are and/or what are they used for. More specifically those with TYPE sock and ...
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1answer
61 views

Why /proc has nosuid on Ubuntu

I notice /proc and /dev is mounted differently on ubuntu than other linux distribution as follows: Ubuntu: udev on /dev type devtmpfs (rw,nosuid,relatime,size=4079136k,nr_inodes=1019784,mode=755) ...
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0answers
541 views

bind mount /proc in Docker container with user namespaces enabled

My dockerd (CentOS7: 17.12.0-ce, build c97c6d6) is running with user namespaces enabled for better isolation. Now I build a image which is supposed to read for monitoring purposes also from /proc of ...
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0answers
223 views

Mounted device showing in df and /etc/mtab but missing from /proc/mounts and /proc/self/mounts. Why?

I have an ec2 instance that is booted from an ebs snapshot. The boot device is /dev/sda1. When I call mount, df -h or cat /etc/fstab I can see the device: $ mount /dev/sda1 on / type ext3 (rw) $ df -...
4
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1answer
2k views

Interpreting read, write and total IO time in /proc/diskstats

I've noticed that when I look at the output of /proc/diskstats there is a discrepancy between the total time spent reading, the total time spent writing, and the total time performing IO. For example, ...
2
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2answers
2k views

Restart docker container in privileged mode

I have a docker container that is not coping with the load. I need increase the value in /proc/sys/net/core/somaxconn but I'm unable to do so because the container is not running in privileged mode. ...
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1answer
1k views

What is the default maximum value for /proc/sys/kernel/shmmax

I am having an amiguity as to what the maximum value in shmmax should be set. After having a look at my system's statistics, it shows the following: #cat /proc/sys/kernel/shmmax ...
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1answer
28 views

monitor another users current working directory

I would like to monitor a users current working directory. This is a learning app and I would like to know when the user was able to cd into a directory. Also this is in docker. I am root, but when ...
2
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1answer
191 views

Default values on missing procfs and sysctl settings

I have several questions regarding the handling of procfs or sysctl values. Can a feature be enabled with a missing /proc file? Does a missing /proc or sysctl entry always mean that the option is ...
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0answers
47 views

is it possible to run process that use only 2 CPU from 16 CPU in my linux machine

is it possible to run process that use only 2 CPU from 16 CPU in my linux machine we have red-hat machine version 6 and we have 16 CPU but because license cost money and if we limit the script that ...
1
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1answer
69 views

Extracting Source => Destination rx / tx from procfs (/proc)

I know I can get rx and tx bytes for each NIC from /proc/..., but I'm looking to get rx and tx info for each source => destination pair -- basically traffic info for each network connection. In /proc/...
3
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0answers
377 views

what is snmp mib for getting NFS IO counters?

I can get local disk I/O requests and read/write bytes using the following snmp MIB: SNMP table: UCD-DISKIO-MIB::diskIOTable diskIOIndex diskIODevice diskIONRead diskIONWritten diskIOReads ...
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2answers
476 views

Owner can't read /proc/$pid/io

On CentOS 7, I am trying to debug an issue where the nginx amplify agent cannot read /proc/$pid/io even though it is owned by the proper user. One of the nginx worker processes right now is pid 5693: ...
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2answers
802 views

proc's limit and ulimit -f don't match

I have an issue where a process has a different max file size than the ulimit for a user. The log file for this process is basically not growing past 524288 proc: less /proc/20238/limits Limit ...
3
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1answer
968 views

/proc/diskstats: No such file or directory

Trying to get some disk performance metrics (in particular, using munin), found that /proc/diskstats does not exist. Tried yum provides '*/diskstats' but nothing except munin was found. CentOS ...