EX200 Deploy, configure, and maintain systems — All Questions With Answers

Refer to the exhibit.

# cat /etc/systemd/system/example.service
[Unit]
Description=Example Service
After=network.target

[Service]
Type=simple
ExecStart=/usr/local/bin/example.sh
Restart=on-failure

[Install]
WantedBy=multi-user.target

# systemctl daemon-reload

Refer to the exhibit.

# lsblk
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda      8:0    0   20G  0 disk
├─sda1   8:1    0    1G  0 part /boot
├─sda2   8:2    0    2G  0 part [SWAP]
└─sda3   8:3    0   17G  0 part /
sdb      8:16   0   10G  0 disk
└─sdb1   8:17   0   10G  0 part /mnt/data

# df -h /mnt/data
Filesystem      Size  Used Avail Use% Mounted on
/dev/sdb1       9.8G  7.5G  2.3G  77% /mnt/data

Refer to the exhibit.

# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda1        20G   15G  4.6G  77% /
/dev/sdb1        50G   10G   40G  20% /var
/dev/sdc1       100G   90G   10G  90% /data

Refer to the exhibit.

```
/dev/mapper/vg_root-lv_root / xfs defaults 1 1
UUID=1234-5678 /boot xfs defaults 1 2
/dev/mapper/vg_root-lv_home /home xfs defaults 1 2
192.168.1.100:/export /mnt nfs4 defaults 0 0
```

Refer to the exhibit.

```
$ df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda1        20G   15G  5.0G  75% /
tmpfs           1.5G  2.3M  1.5G   1% /dev/shm
/dev/sdb1       100G   10G   90G  10% /data

$ ls -ld /data
drwx------. 6 root root 4096 Jan 1 12:00 /data
```

Refer to the exhibit.

```
$ systemctl status crond
● crond.service - Command Scheduler
   Loaded: loaded (/usr/lib/systemd/system/crond.service; disabled; vendor preset: disabled)
   Active: inactive (dead)
```

# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda1       9.8G  6.2G  3.2G  66% /
/dev/sda2       4.0G  2.1G  1.8G  54% /boot
/dev/mapper/vg_data-lv_backup  500G  450G   50G  90% /backup
tmpfs           7.8G   1.2G  6.6G  16% /dev/shm

# systemctl status sshd
● sshd.service - OpenSSH server daemon
   Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled; vendor preset: enabled)
   Active: active (running) since Mon 2023-03-20 10:15:00 EDT; 2 weeks 3 days ago
     Docs: man:sshd(8)
           man:sshd_config(5)
 Main PID: 1234 (sshd)
    Tasks: 1 (limit: 23456)
   Memory: 4.2M
   CGroup: /system.slice/sshd.service
           └─1234 /usr/sbin/sshd -D

Filesystem      Size  Used Avail Use% Mounted on
/dev/mapper/rhel-root   50G   45G  5.2G  90% /
/dev/sda1      1014M  312M  703M  31% /boot

$ journalctl -u sshd.service -p err --since yesterday
-- Logs begin at Mon 2024-03-25 10:00:00 EDT, end at Tue 2024-03-26 09:30:00 EDT
Mar 25 14:22:31 server sshd[1234]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=192.168.1.100  user=root
Mar 25 14:22:35 server sshd[1234]: Failed password for root from 192.168.1.100 port 22 ssh2
Mar 25 14:23:01 server sshd[1235]: fatal: Unable to negotiate with 192.168.1.101 port 22: no matching host key type found. Their offer: ssh-rsa,ssh-dss
Mar 25 14:23:02 server sshd[1235]: Connection closed by 192.168.1.101