RStudio server default credentials not working

[asmariyaz23]

I am trying to install RStudio server on a server in my lab. I have installed R prior and here is the sessionInfo()

R version 3.5.2 (2018-12-20)
Platform: x86_64-redhat-linux-gnu (64-bit)
Running under: CentOS Linux 7 (Core)

Matrix products: default
BLAS/LAPACK: /usr/lib64/R/lib/libRblas.so

locale:
 [1] LC_CTYPE=en_CA.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=en_CA.UTF-8        LC_COLLATE=en_CA.UTF-8    
 [5] LC_MONETARY=en_CA.UTF-8    LC_MESSAGES=en_CA.UTF-8   
 [7] LC_PAPER=en_CA.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=en_CA.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

loaded via a namespace (and not attached):
[1] compiler_3.5.2

I have installed apache and RStudio server and both status show it is running:

● httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; disabled; vendor preset: disabled)
   Active: active (running) since Wed 2019-03-27 07:51:19 EDT; 17h ago
     Docs: man:httpd(8)
           man:apachectl(8)
  Process: 45944 ExecStop=/bin/kill -WINCH ${MAINPID} (code=exited, status=0/SUCCESS)
 Main PID: 45953 (httpd)
   Status: "Total requests: 103; Current requests/sec: 0; Current traffic:   0 B/sec"
    Tasks: 13
   CGroup: /system.slice/httpd.service
           ├─45953 /usr/sbin/httpd -DFOREGROUND
           ├─45954 /usr/sbin/httpd -DFOREGROUND
           ├─45955 /usr/sbin/httpd -DFOREGROUND
           ├─45956 /usr/sbin/httpd -DFOREGROUND
           ├─45957 /usr/sbin/httpd -DFOREGROUND
           ├─45958 /usr/sbin/httpd -DFOREGROUND
           ├─45959 /usr/sbin/httpd -DFOREGROUND
           ├─45968 /usr/sbin/httpd -DFOREGROUND
           ├─45970 /usr/sbin/httpd -DFOREGROUND
           └─45971 /usr/sbin/httpd -DFOREGROUND

Mar 27 07:51:19 localhost.localdomain systemd[1]: Starting The Apache HTTP Server...
Mar 27 07:51:19 localhost.localdomain httpd[45953]: AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using localhost.local...is message
Mar 27 07:51:19 localhost.localdomain systemd[1]: Started The Apache HTTP Server.
Hint: Some lines were ellipsized, use -l to show in full.

● rstudio-server.service - RStudio Server
   Loaded: loaded (/etc/systemd/system/rstudio-server.service; enabled; vendor preset: disabled)
   Active: active (running) since Wed 2019-03-27 14:32:32 EDT; 10h ago
  Process: 5211 ExecStop=/usr/bin/killall -TERM rserver (code=exited, status=0/SUCCESS)
  Process: 5259 ExecStart=/usr/lib/rstudio-server/bin/rserver (code=exited, status=0/SUCCESS)
 Main PID: 5261 (rserver)
    Tasks: 3
   CGroup: /system.slice/rstudio-server.service
           └─5261 /usr/lib/rstudio-server/bin/rserver

Mar 27 14:32:32 localhost.localdomain systemd[1]: Starting RStudio Server...
Mar 27 14:32:32 localhost.localdomain systemd[1]: Started RStudio Server.

However, when I do the following, there is no output:

sudo rstudio-server verify-installation

In error logs under /var/log/messages, I see

Mar 28 01:00:02 localhost systemd: Started Session 25163 of user root.
Mar 28 01:00:02 localhost systemd: Starting Session 25163 of user root.
Mar 28 01:01:01 localhost systemd: Started Session 25164 of user root.
Mar 28 01:01:01 localhost systemd: Starting Session 25164 of user root.
Mar 28 01:10:01 localhost systemd: Started Session 25165 of user root.
Mar 28 01:10:01 localhost systemd: Starting Session 25165 of user root.
Mar 28 01:20:01 localhost systemd: Started Session 25166 of user root.
Mar 28 01:20:01 localhost systemd: Starting Session 25166 of user root.

When I try to login to the RStudio session, it refuses the default username and password, which I believe are my login credentials on the server. I have also checked if the uid is below 500 and it is. Is there something else I should do to resolve the issue?

Thank you,
Asma

[asmariyaz23]

I realize now that the UID must above 500 for RStudio server to work. Will changing UID of my user have any ill side effects?

[kevinushey]

I don't think there will be any ill effects.

My understanding is that (at least by default) Linux reserves IDs below 1000 for system processes, so it's more typical for user accounts to have an ID > 1000.