kme + sysadmin   1254

Prevent .DS_Store file creation on network volumes - Mac OS X Hints
<code class="language-bash">find /Volumes/PSP/ | grep -ir '\(\._\..*\|\.AppleDouble\|\.AppleDesktop\|ws_ftp\.log\|Thumbs\.db\|pspbrwse\.jbf\)$' \
| sed 's/^\(.*\)$/rm -f "\1"/' | /bin/sh</code>
finder  mac  macos  annoyance  network  filesytem  sysadmin 
3 days ago by kme
linux - rsync copy over only certain types of files using include option - Stack Overflow
Here's the important part from the man page:
As the list of files/directories to transfer is built, rsync checks each name to be transferred against the list of include/exclude patterns in turn, and the first matching pattern is acted on: if it is an exclude pattern, then that file is skipped; if it is an include pattern then that filename is not skipped; if no matching pattern is found, then the filename is not skipped.

To summarize:

* Not matching any pattern means a file will be copied!
* The algorithm quits once any pattern matches

Also, something ending with a slash is matching directories (like find -type d would).

Let's pull apart this answer from above.
<code class="language-bash">rsync -zarv --prune-empty-dirs --include "*/" --include="*.sh" --exclude="*" "$from" "$to"</code>

* Don't skip any directories
* Don't skip any .sh files
* Skip everything
* (Implicitly, don't skip anything, but the rule above prevents the default rule from ever happening.)

Finally, the --prune-empty-directories keeps the first rule from making empty directories all over the place.
rsync  backupandrecovery  filemanagement  sysadmin  solution 
14 days ago by kme
md5sum on Mac OS X | check MD5 hashes
tl;dr: use 'md5', but it doesn't have a '-c' option.
macos  checksum  hashes  md5  sysadmin  security  sortof  solution 
15 days ago by kme
I have the best users.... : sysadmin
We're 47 1/2 hours into a system wide network outage that took down all of our storage and by extension our VMWare infrastructure. We're finally on the downside and hope to have mission critical up by Sunday.But various departments have provided a steady stream of support in the form of food & drinks while we work 16 - 20 hours a day to get this back up. Literally they setup a buffet table in a conference room. Sometimes I love my users and my organization.


from the comments:
Someone didn't set SCE to Aux

Sounds like someone forgot to water the spanning tree again
sysadmin  users  forthecomments 
19 days ago by kme
Uploading big files > 512MB — ownCloud 8.0 Server Administration Manual 8.0 documentation
Via https://github.com/owncloud/core/issues/13721.
Set the following two parameters inside the corresponding .ini file:
<code class="language-ini">php_value upload_max_filesize = 16G
php_value post_max_size = 16G
</code>

Adjust these values for your needs. If you see PHP timeouts in your logfiles, increase the timeout values, which are in seconds:
<code class="language-ini">php_value max_input_time 3600
php_value max_execution_time 3600</code>
webmaster  sysadmin  owncloud  bigfiles  uploader  filesharing  collaboration  solution 
20 days ago by kme
FAQ - btrfs Wiki
From kernel 5.0+ btrfs have native swap files support, but with some limitations. Swap file - must be fully allocated as NOCOW with no compression on one device.
linux  sysadmin  swap  swapfile  btrfs  solution 
21 days ago by kme
Solved: Isilon Vs ECS - Dell Community
Furthermore Isilon is more a "Filecentric" solution which offers you access to files through different protocols while ECS is "Objectstorage" which offers you acces to objects through several protocols, this said ECS has WORM by design.

Think of ECS in the same way as you may have thought of Centera in the past, a really big archive. It can do more as sluetze said with regards to geo-load balancing and so-forth, and supports the Centera CAS API, and S3. File protocols were added later to ECS initially NFSv3 only, and I think recently SMB as well. But on the big data side it doesn't speak HDFS like Isilon does, and it's not meant to be best of breed performance for really large HDFS datasets. As I understand it the HDFS access is actually over NFS using a java library. So maybe a good spot for cold buckets of data, not hot.
enterpriseclass  storage  isilon  emc  ecs  sysadmin 
23 days ago by kme
monitoring - Is there a tool that allows logging of memory usage? - Unix & Linux Stack Exchange
Valgrind and syrupy (https://github.com/jeetsukumaran/Syrupy) are two options.

Also ('pidstat -r' is what you want):

The pidstat command also from the sysstat package provides a fairly nice interface for reporting statistics on single process. – Steven D Jan 13 '11 at 22:21


Today I learned:
Occasionally when the need arises I just do:
<code class="language-bash">$ top -d 1 -b |grep <process> >>somefile</code>

It's not an elegant solution, but gets the job done if you want the quick crude value to verify your hypothesis.
sysadmin  memory  systemmonitoring  profiling  debugging  maybesolution 
5 weeks ago by kme
escaping double quotes and percent signs (%) in cron - Server Fault
You have to escape the % signs. They have a special meaning in crontabs:
cron  crontab  shellscripting  sysadmin  dammitbrain  solution 
6 weeks ago by kme
HowTos/NewerApps - CentOS Wiki
You might need to do something like

<code class="language-bash">
yum-config-manager --enable centos-sclo-sclo
yum-config-manager --enable centos-sclo-sclo-rh
</code>

…even *after* installing the 'centos-release-scl' package.
centos  epel  scl  sysadmin  packagemanagement  centos6  solution 
6 weeks ago by kme
bash - How to check if a process id (PID) exists - Stack Overflow
Looks like 'ps -p $PID' is the way to go; 'kill -0 $PID' has caveats.
unix  linux  sysadmin  processmanagement  shellscripting 
8 weeks ago by kme
How to check if port is in use on Linux or Unix - nixCraft
<code class="language-bash">sudo lsof -i -P -n | grep LISTEN
sudo netstat -tulpn | grep LISTEN
sudo lsof -i:22 ## see a specific port such as 22 ##
sudo nmap -sTU -O IP-address-Here</code>
linux  bash  sysadmin  networking  solution 
9 weeks ago by kme
json - xargs: how to have literal double-quotes in replacement? - Stack Overflow
GNU Parallel was built specifically to deal with xargs bad handling of special chars:
<code class="language-bash"><source parallel curl -X POST -H "application/json" myURL -d {}</code>
shellscripting  sysadmin  xargs  gnuparallel  quoting  woes 
12 weeks ago by kme
hard drive - Disk usage per user in Linux / Unix - Server Fault
<code class="language-bash">find . -type f -printf "%u %s\n" \
| awk '{user[$1]+=$2}; END{for(i in user) print i,user[i]}'</code>
diskusage  sysadmin  linux  unix  solution 
september 2019 by kme
find disk usage per user on a filesystem
<code class="language-bash">find / -printf "%u %s\n" \
| awk '{user[$1]+=$2}; END{ for( i in user) print i " " user[i]}'</code>
bash  unix  sysadmin  diskusage  quota  storage  solution 
september 2019 by kme
The Complete Guide to Creating Symbolic Links (aka Symlinks) on Windows
<code class="lang-batch">
:: Use /D when you want to create a soft link pointing
:: to a directory. like so:
mklink /D Link Target
</code>
symlink  junctionpoints  directoryjunction  hardlink  windows  sysadmin  cli  commandline  mklink  reference  solution  dammitbrain 
september 2019 by kme
How to list all tags of a docker image
This is one way to do this, and it works. See also this Gist, which 'docker pulls' a bunch of Bash images to see if that version of Bash has a certain 'shopt' option: https://gist.github.com/ernstki/b782cc7f2a29ec01c1f4355f2dd312cc.
<code class="language-bash">
image=debian
for (( i=0; $?==0; i++ )); do
i=$((i+1))
curl -sL https://registry.hub.docker.com/v2/repositories/library/$image/tags/?page=$i 2>/dev/null \
| jq -r '.results[]["name"]'
done</code>
You can also get the total number of tags from the "count" attribute of the first JSON response, which also gives you the "next" URL.

Possibly see also: https://docs.docker.com/v17.09/registry/spec/api/, but I don't know what the difference between Docker Hub, Docker Registry, and a Docker "Trusted" Registry is, or which one exactly the public Docker Hub is.
docker  cli  commandline  containers  automation  sysadmin  solution 
august 2019 by kme
passwords - MySQL Utilities - ~/.my.cnf option file - Stack Overflow
The gist is that the other utilities ('mysqldump', for example) use different "defaults groups."
mysql  commandline  cli  sysadmin  dba  newbie  question  answered  solution 
august 2019 by kme
How to Check CentOS Version Number
<code class="language-bash">cat /etc/centos-release</code>
sysadmin  centos  release  solution 
july 2019 by kme
Th Most Handy du (Disk Usage) Commands in Linux - Make Tech Easier
Honestly did not know about the '--threshold' or exclusion options.
sysadmin  diskspace  unix  linux  du  tipsandtricks 
july 2019 by kme
OpenConnect VPN client. | https://www.infradead.org/
On Linux, it's possible to create its tun device in advance. For example:
<code class="language-bash">
# ip tuntap add vpn0 mode tun user dwmw2
</code>

This creates a device vpn0 which can be opened by user dwmw2 who can pass traffic to/from it without needing any elevated privileges. You can now tell OpenConnect to use that device by adding "-i vpn0" to its command-line arguments. Note that the /dev/net/tun device node should be readable and writeable by everyone. (Some distributions misconfigure that, so if it isn't world-writeable then please file a bug against your distribution.)
vpn  cisco  anyconnect  linux  networking  sysadmin  maybesolution 
july 2019 by kme
docker - Setting the hostname for a container running in Kubernetes - Stack Overflow
Yeah, no, with a CentOS 7 docker image, after it's already running, it doesn't look like you can change the hostname, because you get the "hostname: you must be root to change the host name" even when you're (obviously) running as root.
centos  centos7  docker  sysadmin  hostname  almostsolution 
june 2019 by kme
How to Set Up System Locale on CentOS 7 | RoseHosting
I think 'localectl' is not built into the base CentOS 7 OS or something? Or at least not the Docker image? Because, sure enough, it wasn't there before, and after a 'yum update' it is.

For a CentOS 7 Docker image, however, you still need to 'yum reinstall -y glibc-common' and just set 'LC_ALL' or 'LANG' in your environment; the 'localectl' command won't work because there's no D-Bus daemon running on the Docker image.
centos  locale  language  sysadmin  sortof  solution  docker 
june 2019 by kme
umask - cmdline Unix Permissions bits calculator - Unix & Linux Stack Exchange
Useful for this tidbit alone:
<code class="language-bash">printf '%o\n' "$((value ^ 511))"</code>
unix  sysadmin  permissions  permissionbits  posixbits  bashscripting  calculator 
june 2019 by kme
Systems We Love
Do you become unusually fascinated by the inner workings of systems? Do you become uncontrollably intrigued when systems fail? If so, you might suffer from a love of systems, an affliction whose symptoms can include arcane bedside reading, hard-to-explain demos and befuddled family members. If you are a systems lover -- or think you might be one -- then be sure to follow us for updates on the next Systems We Love event.
conference  sysadmin  systemsprogramming  video  talks  nerdery 
june 2019 by kme
Rack Attack | GitLab
Documentation for GitLab Community Edition, GitLab Enterprise Edition, Omnibus GitLab, and GitLab Runner.
gitlab  sysadmin  rackattack  throttling  configsetting  maybesolution 
june 2019 by kme
Abundant Scripting Is Good | UNIX Scripting Tips and Ideas - Kimball Hawkins
I doubt there is any System Administrator out there who doesn't realize that scripting is good, but I've found there are few who actually use scripting as I feel it should be used -- as a way to programatically improve, simplify and automate many of the complex and tedious tasks of system monitoring and maintenance.…

My first rule is, if I have to do any task more than once, I’ll script it. This applies especially if errors in the command can have serious consequences.

My second rule is, if I’m going to script it, I’m going to make it robust enough to be useful in all applicable situations.

My third rule is I never hard-code specific information in a script if I can help it.

Fourth is: If a script can figure something out, don’t require the user to enter it, or choose it or find it.

Fifth is: Document it!
sysadmin  shellscripting  unix  linux  bash 
june 2019 by kme
unix - tar – extract discarding directory structure - Super User | https://superuser.com/
If you just want to remove a few path segments, then --strip-components=n or --strip=n will often do:
<code class="language-bash">
tar xvzf tgz --strip=1
</code>
unix  linux  sysadmin  tar  archive  backupandrecovery  solution 
may 2019 by kme
Ubuntu: Rename an Account [ User ID ] - nixCraft
'usermod -l newuserid olduserid', but 'groupmod -n newgroupid oldgroupid'.
ubuntu  linux  sysadmin  usermanagement  usermod  solution 
may 2019 by kme
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