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Database Clients on Linux

You can run database clients on your Linux distro by installing them.

MySQL

$ yum install mysql
$ apt install mysql

Postgress

$ yum install postgresql postgresql-client
$ apt install postgresql postgresql-client

MSSQL

$ yum install mysql-tools
$ apt install mssql-tools

Restart RPC GSSD Service

If a Linux user is having an access problem with a NFS share, and particularly with key expiration, then check if the RPC GSSD service is up and running. NFS clients uses the RPCSEC_GSS protocol to establish security credentials with a NFS server using Kerberos authentication.

Here’s an example of a key expire error due to a NFS client not authenticated properly.

df -h
df: '/data/dir1': Key has expired
df: '/data/dir2': Key has expired
df: '/data/dir3': Key has expired

Check if RPC GSSD service is healthy. Restart the service if there are credential errors.

service rpc-gssd status

Here’s one with an authentication issue.

[root@server ~]# service rpc-gssd status
Redirecting to /bin/systemctl status rpc-gssd.service
● rpc-gssd.service - RPC security service for NFS client and server
   Loaded: loaded (/usr/lib/systemd/system/rpc-gssd.service; static; vendor preset: disabled)
   Active: active (running) since Sun 2021-01-31 03:16:43 CST; 2h 14min ago
 Main PID: 710 (rpc.gssd)
   Memory: 1.6M
   CGroup: /system.slice/rpc-gssd.service
           └─710 /usr/sbin/rpc.gssd
 
Jan 31 03:17:10 server.domain.com rpc.gssd[710]: ERROR: gssd_refresh_krb5_machine_credential: no usable keytab entry found
Jan 31 03:17:10 server.domain.com rpc.gssd[710]: ERROR: No credentials found for connection to server nas.domain.com
Jan 31 03:17:10 server.domain.com rpc.gssd[710]: ERROR: gssd_refresh_krb5_machine_credential: no usable keytab entry found
Jan 31 03:17:10 server.domain.com rpc.gssd[710]: ERROR: No credentials found for connection to server nas.domain.com

Restart the service.

service rpc-gssd stop
service rpc-gssd start

Here’s a service that’s healthy.

[root@server ~]# service rpc-gssd status
Redirecting to /bin/systemctl status rpc-gssd.service
● rpc-gssd.service - RPC security service for NFS client and server
   Loaded: loaded (/usr/lib/systemd/system/rpc-gssd.service; static; vendor preset: disabled)
   Active: active (running) since Sun 2021-01-31 05:33:54 CST; 28min ago
  Process: 9809 ExecStart=/usr/sbin/rpc.gssd $GSSDARGS (code=exited, status=0/SUCCESS)
 Main PID: 9810 (rpc.gssd)
   Memory: 804.0K
   CGroup: /system.slice/rpc-gssd.service
           └─9810 /usr/sbin/rpc.gssd
 
Jan 31 05:33:54 server.domain.com systemd[1]: Starting RPC security service for NFS client and server...
Jan 31 05:33:54 server.domain.com systemd[1]: Started RPC security service for NFS client and server.

Encrypt Samba Share

Here’s how to turn on Samba encryption on a share.

Edit /etc/samba/smb.conf on the Samba server.

[global]
server max protocol = SMB3
smb encrypt = required 
lanman auth = no

Edit /etc/samba/smb.conf on the Samba clients.

[global]
smb encrypt = required
client min protocol = SMB2
client max protocol = SMB3

To connect.

smbclient -e -m SMB3 //xxx.xxx.xxx.xxx/share-name -U username