Ubuntu 20.04 "landscape" user account running mysqld
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@d19dotca the landscape tools come out of the box with ubuntu and we at least don't actively purge them from the server during installation. It should however be safe to remove that via apt.
Not sure how much of it came pre-installed for you on that Vultr server, but the following should catch all relevant packages:
apt-get purge landscape-client landscape-client-ui landscape-client-ui-install landscape-common -
@nebulon Excellent, thanks! I'll try to remove those later tonight after taking a VM snapshot to be extra safe.
I've never seen or noticed "landscape" user before so I guess that was already absent from previous web hosts implementations of Ubuntu. -
@d19dotca Given that Cloudron already runs mysqld, it seems strange that landscape can also run mysqld on the host. Somehow, this seems unlikely to me. A better explanation might be that the mysqld you are seeing running as the "landscape" user is actually the mysql addon. Do you see any other mysqld other than the two you listed in the ps output?
ps has no knowledge of containers. So, it will blindly map the user id in the container's user id namespace to the host namespace. This is why you see many programs above running ruby as yellowtent user (there is no yellowtent user in the containers, only on the host). In reality, what's happening is that the "id" in container happens to be same of that of yellowtent on host. Can you check "id landscape" on host and see what it outputs ?
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@girish - I agree, it's likely some abstraction layer of some sort rather than it actually running MySQL, though what's odd is the memory usage is higher for the landscape lines than the yellowtent or mysql ones.
Here's what I can see, if this helps. It seems it duplicates almost everything that Cloudron would be running such as MySQL, PostegreSQL, MongoDB, Dovecot, Turn, etc.
id landscape uid=107(landscape) gid=113(landscape) groups=113(landscape)ps aux | head -1; ps aux | sort -rnk 4 | grep land* USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND landsca+ 944441 1.9 6.7 2114148 554240 ? Sl May26 59:12 /usr/sbin/mysqld landsca+ 944442 0.0 0.5 617712 42208 ? Sl May26 0:22 node /app/code/service.js landsca+ 945567 0.3 0.3 1907948 30932 ? Sl May26 10:30 mongod --config /etc/mongodb.conf --auth landsca+ 942747 1.0 0.2 118748 22820 ? Sl May26 30:43 /usr/bin/python3 /usr/bin/carbon-cache --debug --config=/etc/carbon/carbon.conf start landsca+ 877995 0.0 0.2 150432 19188 ? Ss 17:31 0:00 postgres: 12/main: usere18fa18bb1764b25bf784d82c022b0f5 dbe18fa18bb1764b25bf784d82c022b0f5 172.18.17.160(59512) idle landsca+ 869854 0.0 0.2 150432 18928 ? Ss 17:25 0:00 postgres: 12/main: usere18fa18bb1764b25bf784d82c022b0f5 dbe18fa18bb1764b25bf784d82c022b0f5 172.18.17.160(53876) idle landsca+ 955217 0.0 0.1 156708 15912 ? Ss May26 0:00 postgres: 12/main: usere18fa18bb1764b25bf784d82c022b0f5 dbe18fa18bb1764b25bf784d82c022b0f5 172.18.17.160(36962) idle landsca+ 945568 0.0 0.0 887140 1648 ? Sl May26 0:01 node /app/code/service.js landsca+ 943437 0.0 0.0 394036 6564 ? Sl May26 0:01 uwsgi --master --workers 2 --buffer-size 16384 --no-orphans --ini /etc/uwsgi/apps-enabled/graphite-uwsgi.ini landsca+ 943435 0.0 0.0 395640 6276 ? Sl May26 0:00 uwsgi --master --workers 2 --buffer-size 16384 --no-orphans --ini /etc/uwsgi/apps-enabled/graphite-uwsgi.ini landsca+ 942745 0.0 0.0 76192 80 ? S May26 0:06 uwsgi --master --workers 2 --buffer-size 16384 --no-orphans --ini /etc/uwsgi/apps-enabled/graphite-uwsgi.ini landsca+ 940938 0.0 0.0 148672 812 ? Ss May26 0:00 postgres: 12/main: logical replication launcher landsca+ 940937 0.0 0.0 67336 980 ? Ss May26 0:04 postgres: 12/main: stats collector landsca+ 940936 0.0 0.0 148832 3268 ? Ss May26 0:01 postgres: 12/main: autovacuum launcher landsca+ 940935 0.0 0.0 148136 1620 ? Ss May26 0:02 postgres: 12/main: walwriter landsca+ 940934 0.0 0.0 148136 1644 ? Ss May26 0:01 postgres: 12/main: background writer landsca+ 940932 0.0 0.0 148292 6108 ? Ss May26 0:00 postgres: 12/main: checkpointer landsca+ 940656 0.0 0.0 883480 5988 ? Sl May26 0:00 node /app/code/service.js landsca+ 940655 0.0 0.0 148136 3584 ? S May26 0:03 /usr/lib/postgresql/12/bin/postmaster --config-file=/etc/postgresql/12/main/postgresql.conf landsca+ 934057 0.0 0.0 559180 956 ? Ssl May26 1:19 /usr/bin/turnserver -c /run/turnserver/turnserver.conf --pidfile /run/turnserver/turnserver.pid landsca+ 676796 0.0 0.0 149268 7528 ? Ss 15:04 0:00 postgres: 12/main: root postgres 127.0.0.1(49710) idle landsca+ 3876135 0.0 0.0 149268 4984 ? Ss 03:04 0:00 postgres: 12/main: root postgres 127.0.0.1(52774) idle landsca+ 3505163 0.0 0.0 23128 1720 ? S May27 0:03 dovecot/auth landsca+ 3505162 0.0 0.0 5040 1680 ? S May27 0:03 dovecot/stats landsca+ 3505117 0.0 0.0 4380 148 ? S May27 0:01 dovecot/anvil landsca+ 2867491 0.0 0.0 149268 2816 ? Ss May27 0:00 postgres: 12/main: root postgres 127.0.0.1(47314) idle landsca+ 1867396 0.0 0.0 149268 2552 ? Ss May27 0:00 postgres: 12/main: root postgres 127.0.0.1(51906) idleHere's an example of the mysql memory differences (basically 554 MB used by the landscape version, and just over 100 MB by the mysql user which I assume is the one used by Cloudron?):
ps aux | head -1; ps aux | sort -rnk 4 | grep mysql* USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND landsca+ 944441 1.9 6.7 2115172 554368 ? Sl May26 59:14 /usr/sbin/mysqld mysql 57251 0.5 1.2 2099864 104272 ? Ssl May17 93:44 /usr/sbin/mysqld -
Update: I removed landscape tonight. I had to run a different command because the one provided and also seen in many other articles online couldn't find two of the packages so threw this error:
sudo apt-get purge landscape-client landscape-client-ui landscape-client-ui-install landscape-common Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package landscape-client-ui E: Unable to locate package landscape-client-ui-installSo in order for it to work, I had to run this command instead:
sudo apt-get purge landscape-client landscape-common Reading package lists... Done Building dependency tree Reading state information... Done Package 'landscape-client' is not installed, so not removed The following packages will be REMOVED: landscape-common* 0 upgraded, 0 newly installed, 1 to remove and 20 not upgraded. After this operation, 410 kB disk space will be freed. Do you want to continue? [Y/n] Y (Reading database ... 112984 files and directories currently installed.) Removing landscape-common (19.12-0ubuntu4.2) ... Processing triggers for man-db (2.9.1-1) ... (Reading database ... 112904 files and directories currently installed.) Purging configuration files for landscape-common (19.12-0ubuntu4.2) ...What's weird though is that after removing landscape, and rebooting the server, I still see the processes running as the same user ID (107), so I'm not sure if I really solved anything
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 15631 yellowt+ 20 0 413968 257640 22380 S 0.0 3.2 0:05.81 ruby2.7 15700 yellowt+ 20 0 1144740 256476 11404 S 0.0 3.1 0:00.13 ruby2.7 15630 yellowt+ 20 0 468764 254692 22740 S 0.0 3.1 0:05.35 ruby2.7 15701 yellowt+ 20 0 1144740 251736 9608 S 0.0 3.1 0:00.04 ruby2.7 12150 107 20 0 2091216 240492 37868 S 28.5 2.9 0:05.46 mysqld -
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@girish said in Ubuntu 20.04 "landscape" user account running mysqld:
@d19dotca atleast you removed unused packages
the id inside the container is 107 (mysqld). you can do docker exec -ti mysql /bin/bashand doid mysqlthat will be 107.Very interesting, but now I'm a bit confused, lol. I realize though this is probably a bit outside the realm of Cloudron so no worries if you can't really explain it. Here's what I've seen, if you're able to somehow make heads or tails of this, I'd really appreciate your insight:
When I ran the
docker exec -ti mysql /bin/bashand thenid mysql, you are correct, the UID is 107, as seen below from the container commands output:root@mysql:/# id mysql uid=107(mysql) gid=109(mysql) groups=109(mysql)But what I'm confused on is that the output prior was also UID 107 for the landscape user in the Ubuntu operating system (not in any containers):
id landscape uid=107(landscape) gid=113(landscape) groups=113(landscape)And the MySQL user in the Ubuntu operating system is a different UID than the MySQL user in the container:
id mysql uid=112(mysql) gid=118(mysql) groups=118(mysql)When I do a
top -u 107command, I get the output below which is basically the exact same services being run as it was when it was the landscape user (and remember above that the UID for landscape was also 107):PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 58166 107 20 0 119160 29928 3668 S 7.3 0.4 9:45.91 carbon-cache 58266 107 20 0 400292 2572 1760 S 0.7 0.0 2:35.07 uwsgi 58356 107 20 0 2093932 587804 16052 S 0.7 7.2 17:28.52 mysqld 55356 107 20 0 76192 2700 1780 S 0.0 0.0 0:04.05 uwsgi 55431 107 20 0 559180 2960 1972 S 0.0 0.0 0:20.28 turnserver 58125 107 20 0 4380 768 644 S 0.0 0.0 0:01.45 anvil 58129 107 20 0 5048 2148 1532 S 0.0 0.0 0:02.41 stats 58131 107 20 0 754016 2992 2992 S 0.0 0.0 0:00.34 node 58138 107 20 0 684644 11556 7104 S 0.0 0.1 0:00.26 node 58139 107 20 0 148136 6424 5836 S 0.0 0.1 0:00.74 postmaster 58158 107 20 0 23124 2820 2432 S 0.0 0.0 0:02.68 auth 58159 107 20 0 148276 6356 5700 S 0.0 0.1 0:00.13 postmaster 58160 107 20 0 148136 4356 3800 S 0.0 0.1 0:00.57 postmaster 58161 107 20 0 148136 3740 3208 S 0.0 0.0 0:00.87 postmaster 58162 107 20 0 148832 3812 3096 S 0.0 0.0 0:00.46 postmaster 58163 107 20 0 67336 1428 740 S 0.0 0.0 0:01.03 postmaster 58164 107 20 0 148672 1988 1380 S 0.0 0.0 0:00.02 postmaster 58184 107 20 0 1845196 37176 8872 S 0.0 0.5 3:19.42 mongod 58188 107 20 0 607972 39000 8752 S 0.0 0.5 0:05.85 node 58265 107 20 0 388688 2500 1760 S 0.0 0.0 0:00.28 uwsgi 97998 107 20 0 152832 18840 15760 S 0.0 0.2 0:00.26 postmaster 725610 107 20 0 149768 9380 8932 S 0.0 0.1 0:00.00 postmaster 1353755 107 20 0 150720 20448 17460 S 0.0 0.3 0:00.01 postmaster 1369625 107 20 0 150432 19640 16944 S 0.0 0.2 0:00.01 postmasterNotice the above services are all what Cloudron would be running too (I think anyways), like node, mysql, mongodb, turnserver, etc.
When I run
top | grep mysqlI get both UID 107 running it alongside the actual mysql user too:top | grep mysql 58356 107 20 0 2092908 587516 16008 S 0.8 7.2 17:33.18 mysqld 638 mysql 20 0 2094924 124588 10788 S 0.0 1.5 5:29.17 mysqldIn other words, I sort of feel like I didn't really gain any performance or reduce memory usage by removing landscape. Maybe I'm looking at it wrong though?
Does the above make any sense? I'm not quite following how this works. It almost seems like the landscape-common was uninstalled from the system which removed the landscape user too, but it's effectively still running just as a UID instead of any username. But am I totally misunderstanding this? lol Any insight would be awesome!
PS - I guess this isn’t a Cloudron item so much as an Ubuntu thing, so maybe this should be pushed to Discussion rather than Support? Totally fine with me if you’d prefer that.
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Interestingly, when I tempoprarily spun up a new Cloudron image using the Vultr Marketplace, and if I removed the landscape-common first thing, then it seemed the MySQL instances and everything were only seen in
topwith the MySQL user, no landscape or 107 seen. So I'm going to try spinning up a new permanent Cloudron server using the Cloudron app image on Vultr Marketplace and restore using Cloudron backups. I hope this will clean things up better with any luck. -
So I’m definitely confused. When I spin up a new image, while Landscape is installed it isn’t actively used (I can’t find any running processes with that user), but it definitely gets triggered later when Cloudron is running. I reimaged my server last night to the new Cloudron marketplace app in Vultr, removed landscape before restoring, but eventually ended up in the exact same spot of landscape uninstalled but it’s UID 107 still running (as a UID only) it’s processes as it did earlier when it was installed. It’s the weirdest thing.
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Okay digging into it further, I dropped into bash prompts for other containers like mail, postgresql, etc. And the main service ID in all of them is 107. So I guess this UID 107 when viewing ps or too makes sense? I’m just still confused because I’ve never noticed that behaviour before in the last two or so years of using Cloudron. Why is UID 107 chosen for all containers? How does that UID get set? Also why doesn’t the process list see that user? I swear I never had UIDs shown before in previous installs of Cloudron. I can’t wrap my head around this. Lol. But I admit I guess the landscape packages are indeed removed then, and I guess it’s a coincidence that the main user ID for each Cloudron service container is 107?
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Okay so here's my theory of what's happened before, would love it if @girish could sort of sanity check this for me.
In previous installs, there was no UID 107 used either in Ubuntu or Cloudron services. When I tried a default install in OVH where I didn't ever see landscape before, it turns out landscape DID exist but was never seen in
topbecause it had a UID of 113 or something like that, not 107.Since in my case, the Vultr Ubuntu image has landscape as UID 107 by default, so all the container services running as UID 107 (but mysql, postreqsql, dovecot, etc) would then appear to be run by Lanscape user when it really was just a mix of different users all with the same UID of 107.
Thus when I removed landscape which also removed the user that was mapped to UID 107, then since the Cloudron services are coincidentally using UID 107,
topoutput now shows user 107.Curious though... where does UID 107 come from? I.e. How did Cloudron pick that UID, and why is that UID shared among all the containers but using different usernames in the containers with that UID?
Is my current setup best practice? Is there any issue with there only being a UID shown and no associated username? Would this be resolved if I reimaged the appliance, and then removed landscape prior to even starting the Cloudron install (last time I did it a few minutes during the install so I wonder if I did it too late), would it then create a user properly for that? I tried briefly to do that and then install Cloudron on a new smaller VPS in Vultr, and it seemed like it created MySQL user at 107 instead or something, so the MySQL user in Ubuntu was running many of the services for Cloudron. But I should probably test again.
I've never seen a UID before at all in my Cloudron servers which aren't associated to any username when looking at
top, so I feel like this is just a very unusual circumstance in that Cloudron is running its own services with UID 107 in containers, but Ubuntu image in Vultr had UID 107 associated to Landscape, causing the confusions.Hopefully the above makes sense. Would love your insight into this.
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@d19dotca I got a bit lost with all the notes, but I think you are looking for some understanding of why UIDs are not consistent ? On linux, there's only user ids (user names are just a "friendly" thing for the user which is got from /etc/passwd). In those user ids, 0 (root) is special, rest are all just the same inside the kernel. Ultimately, non-0 uids control the permissions to "files" and "processes". Also, the ids are generated dynamically. So, if you install mysql after 10 different programs, mysql user will have a different id than if you had installed it first. For the kernel and the end user, it makes no difference what the ids are. The mysql files in the file system gets the right dynamic "ids".
Now, for containers, they have their own uid namespace but Cloudron does not use this feature (yet). The uids only control "files" as said above and each container has it's own file system. So, the uids can be totally different inside each container (depending on how you installed programs inside it) but functionally the same (sorry, don't know how to explain this better without writing a full article
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@girish haha, sorry, I was kind of just brain dumping as I learned more about it myself, didn't mean to make it extra confusing.
Okay so I understood how UIDs on the Ubuntu system level work, but I guess where I'm confused is how Cloudron specifies a UID for it's main process in each container, and why are they all the same (in my case they're all UID 107 in each service container, is it always 107 even in new installs?). I think that's where it's throwing me off. Why is Cloudron using UID 107 for example in all of it's service containers running user (like mysql, dovecot, postgresql, etc)?
Additionally, I never have seen a UID used when looking at
topbefore, so is there something perhaps not "registered" properly in my install?As I understand it, Cloudron's containers - at least in my case - are using it's main user accounts for various services with UID 107. In Ubuntu, UID 107 happened to match the landscape user. So when I uninstalled landscape which removed the user too, now there's no system level UID 107 in Ubuntu, but I guess
topsees the UID from the container as UID 107 running the process like mysql, so it outputs 107.I have just never seen this before in any of my many other servers I've build with Cloudron.... so I'm confused I guess by why this is happening in this server seemingly alone, where UID 107 gets generated from in Cloudron's container services, etc.
Hopefully that helps a little bit clarify where my confusion is and what I'm hoping to understand better.
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@d19dotca said in Ubuntu 20.04 "landscape" user account running mysqld:
Okay so I understood how UIDs on the Ubuntu system level work, but I guess where I'm confused is how Cloudron specifies a UID for it's main process in each container, and why are they all the same (in my case they're all UID 107 in each service container, is it always 107 even in new installs?). I think that's where it's throwing me off. Why is Cloudron using UID 107 for example in all of it's service containers running user (like mysql, dovecot, postgresql, etc)?
Ah, I think that's just a happy coincidence. We build all the containers out of the base image . So if you see
docker run -ti cloudron/base:3.0.0 /bin/bashand then inspect/etc/passwd:systemd-resolve:x:103:104:systemd Resolver,,,:/run/systemd:/usr/sbin/nologin messagebus:x:104:106::/nonexistent:/usr/sbin/nologin redis:x:105:107::/var/lib/redis:/usr/sbin/nologin sshd:x:106:65534::/run/sshd:/usr/sbin/nologin cloudron:x:1000:1000:Cloudron,,,:/home/cloudron:/bin/bashIt ends at 106. And the first user that gets installed after gets the UID 107. So, in the addon containers first thing we do is to install the database program which adds their own database user. So, they happen to get 107.
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@girish Ahhh okay, haha, than I guess that makes sense. What a bizarre thing, lol. So if I understand correctly, the next UID in your service containers will get UID 107 since the Docker images you base from go up to UID 106 already. And in my case, since Vultr has it's Ubuntu image using landscape as UID 107 on the operating system level, that's why it looks all weird for me. Okay, I think that makes more sense to me then. haha.
Though one last question... if there was no UID 107 in the /etc/passwd file for example (which I confirmed last night is the case with OVH's instance of Ubuntu), then when Cloudron sets its containers and its user is the given UID 107 in the container, why does
topnot show 107 there instead since there's no system UID 107? I should investigate that a bit more, I think that's the last part of my curiosity. haha.Thanks for bearing with me and explaining everything Girish! I really appreciate it. Always love learning from the experts on these things.
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@d19dotca said in Ubuntu 20.04 "landscape" user account running mysqld:
@girish Ahhh okay, haha, than I guess that makes sense. What a bizarre thing, lol. So if I understand correctly, the next UID in your service containers will get UID 107 since the Docker images you base from go up to UID 106 already. And in my case, since Vultr has it's Ubuntu image using landscape as UID 107 on the operating system level, that's why it looks all weird for me. Okay, I think that makes more sense to me then. haha.
Yup, that's exactly right! I have to say I never noticed this myself, good spot
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@d19dotca said in Ubuntu 20.04 "landscape" user account running mysqld:
Though one last question... if there was no UID 107 in the /etc/passwd file for example (which I confirmed last night is the case with OVH's instance of Ubuntu), then when Cloudron sets its containers and its user is the given UID 107 in the container, why does top not show 107 there instead since there's no system UID 107?
It totally should! What does it show if not for the raw number "107" ?
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So, in vultr this was uuidd (107) in the host image. I removed that line entirely in /etc/passwd. Then, I did ps aux | grep mysql and I got the raw 107 as expected. All the other stuff like postgres, mongo etc show raw 107 as well.
107 4065 0.4 5.8 1559384 235096 ? Sl May27 23:31 /usr/sbin/mysqld -
@girish Yeah that's in Vultr though and what my latest experience has been too. But I guess what I'm meaning is when I have used CLoudron on other providers like LunaNode, OVH, etc. I've never seen this issue before. I suspect it's because there is no UID 107 in the Ubuntu OS in those provider's implementations of it, but if that were the case then I'd supposedly see "107" in all my
topoutput which I've never ever noticed before. That's what I want to try and figure out next, curiosity is getting the better of me. haha. This has been a very interesting puzzle and learning experience. -
Okay, so I ran another test and I think this makes more sense now and sort of validates what you mentioned above.
I spun up a new VPS on Vultr on Ubuntu 20.04 (not the Cloudron marketplace app version), and before I did anything, I immediately uninstalled landscape. This took away UID 107. Then I installed Cloudron, and of course Cloudron created the mysql user with UID 107 which can be verified in /etc/password file too.
Here's my current server:
tcpdump:x:105:111::/nonexistent:/usr/sbin/nologin sshd:x:106:65534::/run/sshd:/usr/sbin/nologin pollinate:x:108:1::/var/cache/pollinate:/bin/false systemd-network:x:109:114:systemd Network Management,,,:/run/systemd:/usr/sbin/nologin systemd-resolve:x:110:115:systemd Resolver,,,:/run/systemd:/usr/sbin/nologin systemd-timesync:x:111:116:systemd Time Synchronization,,,:/run/systemd:/usr/sbin/nologin systemd-coredump:x:999:999:systemd Core Dumper:/:/usr/sbin/nologin mysql:x:112:118:MySQL Server,,,:/nonexistent:/bin/false unbound:x:113:119::/var/lib/unbound:/usr/sbin/nologin nginx:x:114:120:nginx user,,,:/nonexistent:/bin/false yellowtent:x:1000:1000::/home/yellowtent:/bin/shNotice MySQL took UID 112 since at the time of install, landscape user was already generated with UID 107.
On a new server install where I purged landscape prior to installing Cloudron, the MySQL user then takes UID 107 since it's "available":
tcpdump:x:105:111::/nonexistent:/usr/sbin/nologin sshd:x:106:65534::/run/sshd:/usr/sbin/nologin pollinate:x:108:1::/var/cache/pollinate:/bin/false systemd-network:x:109:114:systemd Network Management,,,:/run/systemd:/usr/sbin/nologin systemd-resolve:x:110:115:systemd Resolver,,,:/run/systemd:/usr/sbin/nologin systemd-timesync:x:111:116:systemd Time Synchronization,,,:/run/systemd:/usr/sbin/nologin systemd-coredump:x:999:999:systemd Core Dumper:/:/usr/sbin/nologin mysql:x:107:113:MySQL Server,,,:/nonexistent:/bin/false unbound:x:112:118::/var/lib/unbound:/usr/sbin/nologin nginx:x:113:119:nginx user,,,:/nonexistent:/bin/false yellowtent:x:1000:1000::/home/yellowtent:/bin/shSo when I look at the top output, there's no UID being shown anymore and basically everything appears to run as the mysql user since it's UID 107 which then matches the UID used in the container images:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 614 mysql 20 0 1069132 141280 35112 S 0.0 14.1 0:01.01 mysqld 643 root 20 0 725468 92732 49580 S 0.0 9.2 0:00.35 dockerd 935 yellowt+ 20 0 638720 61260 30140 S 0.0 6.1 0:01.11 node 521 root 20 0 749848 46900 26172 S 0.0 4.7 0:00.32 containerd 497 yellowt+ 20 0 579328 34044 27896 S 0.0 3.4 0:00.16 node 579 root 20 0 110808 21048 13392 S 0.0 2.1 0:00.07 unattended-upgr 504 root 20 0 31976 18176 10464 S 0.0 1.8 0:00.09 networkd-dispat [...]So I guess if I want to "clean" this up (even though there's really no issue at all I guess outside of there being no associated username with UID 107), I should reimage my server and restore from the backup after installing Cloudron only after I've already purged landscape. Though this I admit is really not necessary and I should just get used to seeing UID 107 in the process list and top output and I should know that's coming from the container UIDs then rather than the actual account in Ubuntu (outside of the fact when it actually is MySQL running, lol).
Hopefully the above makes some sense.
