[LINUX] iscsi.service vs iscsid.service

리눅스/개념

[LINUX] iscsi.service vs iscsid.service

ㅎㄷㄹㅁㅇ 2024. 8. 28. 17:40

iscsi 와 iscsid 차이

iscsi 란

iscsi.service는 iscsi device를 scanning 하고 장치에 로그인 하거나, 중지 시 logout 을 담당합니다.

iscsid 란

iscsid.service는 설정의 자동 로그인/로그아웃을 관리하는 데 사용됩니다. iscsid.service는 iscsid의 lifecycle을 관리하며 iscsi.service에서 수동으로 iscsadm 명령을 실행할 때 소켓 활성화를 사용하여 자동으로 시작됩니다.

요약하자면, iscsid.service는 iscsid 데몬 실행을 담당합니다., iscsi.service는 /var/lib/iscsi 하위의 설정 값을 기반으로 target에 연결하도록 iscsid에게 요청합니다.

iscsi, iscsid Service 파일 확인

iscsi.service 파일 확인

# cat /usr/lib/systemd/system/iscsi.service
[Unit]
Description=Login and scanning of iSCSI devices
Documentation=man:iscsid(8) man:iscsiadm(8)
DefaultDependencies=no
Conflicts=shutdown.target
After=systemd-remount-fs.service network.target iscsid.service iscsiuio.service
Before=remote-fs-pre.target
Wants=remote-fs-pre.target iscsi-shutdown.service
ConditionDirectoryNotEmpty=|/var/lib/iscsi/nodes
ConditionDirectoryNotEmpty=|/sys/class/iscsi_session

[Service]
Type=oneshot
RemainAfterExit=true
ExecStart=-/usr/libexec/iscsi-mark-root-nodes
ExecStart=-/sbin/iscsiadm -m node --loginall=automatic
ExecReload=-/sbin/iscsiadm -m node --loginall=automatic

[Install]
WantedBy=sysinit.target

iscsid.service 파일 확인

# cat /usr/lib/systemd/system/iscsid.service
[Unit]
Description=Open-iSCSI
Documentation=man:iscsid(8) man:iscsiadm(8)
DefaultDependencies=no
Conflicts=shutdown.target
After=network.target iscsiuio.service
Before=remote-fs-pre.target

[Service]
Type=forking
PIDFile=/var/run/iscsid.pid
ExecStart=/usr/sbin/iscsid
ExecStop=/sbin/iscsiadm -k 0 2

[Install]
WantedBy=multi-user.target

iscsi 연결 중 daemon stop, start 진행

iscsi device discovery , login

iscsi device discover 진행

# ls -al /var/lib/iscsi/nodes/
total 0
drwxr-xr-x 2 root root  6 Aug 28 16:05 .
drwxr-xr-x 8 root root 90 Feb 13  2024 ..

# iscsiadm -m node
iscsiadm: No records found

# iscsiadm -m session
iscsiadm: No active sessions.

# sudo iscsiadm -m discovery -t st -p  200.200.10.181
200.200.10.181:3260,1 iqn.2024-02.com.data:test-data
200.200.10.181:3260,1 iqn.2024-02.com.sbd:test-sbd

# ls -al /var/lib/iscsi/nodes/
total 0
drwxr-xr-x 4 root root 80 Aug 28 16:05 .
drwxr-xr-x 8 root root 90 Feb 13  2024 ..
drw------- 3 root root 35 Aug 28 16:05 iqn.2024-02.com.data:test-data
drw------- 3 root root 35 Aug 28 16:05 iqn.2024-02.com.sbd:test-sbd

# iscsiadm -m node
200.200.10.181:3260,1 iqn.2024-02.com.data:test-data
200.200.10.181:3260,1 iqn.2024-02.com.sbd:test-sbd

# iscsiadm -m session
iscsiadm: No active sessions.

iscsi device login 진행

# sudo iscsiadm --mode node --targetname iqn.2024-02.com.sbd:test-sbd -p 200.200.10.181:3260 --login
Logging in to [iface: default, target: iqn.2024-02.com.sbd:test-sbd, portal: 200.200.10.181,3260]
Login to [iface: default, target: iqn.2024-02.com.sbd:test-sbd, portal: 200.200.10.181,3260] successful.

# sudo iscsiadm --mode node --targetname iqn.2024-02.com.data:test-data -p 200.200.10.181:3260 --login
Logging in to [iface: default, target: iqn.2024-02.com.data:test-data, portal: 200.200.10.181,3260]
Login to [iface: default, target: iqn.2024-02.com.data:test-data, portal: 200.200.10.181,3260] successful.

# iscsiadm -m session
tcp: [3] 200.200.10.181:3260,1 iqn.2024-02.com.sbd:test-sbd (non-flash)
tcp: [4] 200.200.10.181:3260,1 iqn.2024-02.com.data:test-data (non-flash)

discovery 전에 login을 할 경우 login 불가

# sudo iscsiadm --mode node --targetname iqn.2024-02.com.data:test-data -p 200.200.10.181:3260 --login
iscsiadm: No records found

# sudo iscsiadm --mode node --targetname iqn.2024-02.com.sbd:test-sbd -p 200.200.10.181:3260 --login
iscsiadm: No records found

# sudo iscsiadm -m discovery -t st -p  200.200.10.181
200.200.10.181:3260,1 iqn.2024-02.com.data:test-data
200.200.10.181:3260,1 iqn.2024-02.com.sbd:test-sbd

# sudo iscsiadm --mode node --targetname iqn.2024-02.com.data:test-data -p 200.200.10.181:3260 --login
Logging in to [iface: default, target: iqn.2024-02.com.data:test-data, portal: 200.200.10.181,3260]
Login to [iface: default, target: iqn.2024-02.com.data:test-data, portal: 200.200.10.181,3260] successful.

# sudo iscsiadm --mode node --targetname iqn.2024-02.com.sbd:test-sbd -p 200.200.10.181:3260 --login
Logging in to [iface: default, target: iqn.2024-02.com.sbd:test-sbd, portal: 200.200.10.181,3260]
Login to [iface: default, target: iqn.2024-02.com.sbd:test-sbd, portal: 200.200.10.181,3260] successful.

iscsi device logout, delete

iscsi logout

# sudo iscsiadm --mode node --targetname iqn.2024-02.com.sbd:test-sbd -p 200.200.10.181:3260 --logout
Logging out of session [sid: 3, target: iqn.2024-02.com.sbd:test-sbd, portal: 200.200.10.181,3260]
Logout of [sid: 3, target: iqn.2024-02.com.sbd:test-sbd, portal: 200.200.10.181,3260] successful.

# sudo iscsiadm --mode node --targetname iqn.2024-02.com.data:test-data -p 200.200.10.181:3260 --logout
Logging out of session [sid: 4, target: iqn.2024-02.com.data:test-data, portal: 200.200.10.181,3260]
Logout of [sid: 4, target: iqn.2024-02.com.data:test-data, portal: 200.200.10.181,3260] successful.

# iscsiadm -m node
200.200.10.181:3260,1 iqn.2024-02.com.data:test-data
200.200.10.181:3260,1 iqn.2024-02.com.sbd:test-sbd

# iscsiadm -m session
iscsiadm: No active sessions.

iscsi device delete

# iscsiadm --mode node --targetname iqn.2024-02.com.sbd:test-sbd -p 200.200.10.181:3260 -o delete

# iscsiadm --mode node --targetname iqn.2024-02.com.data:test-data -p 200.200.10.181:3260 -o delete

# iscsiadm -m node
iscsiadm: No records found

# iscsiadm -m session
iscsiadm: No active sessions.

iscsi, iscsid 데몬 재시작 시 iscsi 연결 상태 확인

iscsi login 상태에서 iscsi 데몬 재시작을 진행하더라도 iscsi connection은 끊어지지 않음

# iscsiadm -m session
tcp: [5] 200.200.10.181:3260,1 iqn.2024-02.com.data:test-data (non-flash)
tcp: [6] 200.200.10.181:3260,1 iqn.2024-02.com.sbd:test-sbd (non-flash)

# systemctl status iscsi
● iscsi.service - Login and scanning of iSCSI devices
   Loaded: loaded (/usr/lib/systemd/system/iscsi.service; enabled; vendor preset: disabled)
   Active: active (exited) since Wed 2024-08-28 15:42:18 KST; 29min ago
     Docs: man:iscsiadm(8)
           man:iscsid(8)
  Process: 935 ExecStart=/usr/sbin/iscsiadm -m node --loginall=automatic (code=exited, status=0/SUCCESS)
 Main PID: 935 (code=exited, status=0/SUCCESS)
    Tasks: 0 (limit: 11348)
   Memory: 0B
   CGroup: /system.slice/iscsi.service
...

# systemctl stop iscsi

# systemctl status iscsi
● iscsi.service - Login and scanning of iSCSI devices
   Loaded: loaded (/usr/lib/systemd/system/iscsi.service; enabled; vendor preset: disabled)
   Active: inactive (dead) since Wed 2024-08-28 16:12:02 KST; 1s ago
     Docs: man:iscsiadm(8)
           man:iscsid(8)
  Process: 935 ExecStart=/usr/sbin/iscsiadm -m node --loginall=automatic (code=exited, status=0/SUCCESS)
 Main PID: 935 (code=exited, status=0/SUCCESS)
...

# iscsiadm -m session
tcp: [5] 200.200.10.181:3260,1 iqn.2024-02.com.data:test-data (non-flash)
tcp: [6] 200.200.10.181:3260,1 iqn.2024-02.com.sbd:test-sbd (non-flash)

iscsid login 상태에서 iscsi 데몬 재시작을 진행하더라도 iscsi connection은 끊어지지 않음

# systemctl status iscsid
● iscsid.service - Open-iSCSI
   Loaded: loaded (/usr/lib/systemd/system/iscsid.service; disabled; vendor preset: disabled)
   Active: active (running) since Wed 2024-08-28 15:42:18 KST; 30min ago
     Docs: man:iscsid(8)
           man:iscsiuio(8)
           man:iscsiadm(8)
 Main PID: 1128 (iscsid)
   Status: "Ready to process requests"
    Tasks: 1 (limit: 11348)
   Memory: 11.4M
   CGroup: /system.slice/iscsid.service
           └─1128 /usr/sbin/iscsid -f
...

# systemctl stop iscsid
Warning: Stopping iscsid.service, but it can still be activated by:
  iscsid.socket

# systemctl status iscsid
● iscsid.service - Open-iSCSI
   Loaded: loaded (/usr/lib/systemd/system/iscsid.service; disabled; vendor preset: disabled)
   Active: inactive (dead) since Wed 2024-08-28 16:12:41 KST; 1min 43s ago
     Docs: man:iscsid(8)
           man:iscsiuio(8)
           man:iscsiadm(8)
  Process: 1128 ExecStart=/usr/sbin/iscsid -f (code=exited, status=0/SUCCESS)
 Main PID: 1128 (code=exited, status=0/SUCCESS)
   Status: "Ready to process requests"
...

# iscsiadm -m session
tcp: [5] 200.200.10.181:3260,1 iqn.2024-02.com.data:test-data (non-flash)
tcp: [6] 200.200.10.181:3260,1 iqn.2024-02.com.sbd:test-sbd (non-flash)

iscsi, iscsid 데몬 기동 별 iscsi session connection

iscsi enable / iscsid disable

# systemctl list-unit-files  | grep iscsi
iscsi-onboot.service                       disabled 
iscsi-shutdown.service                     static   
iscsi.service                              enabled  
iscsid.service                             disabled 
iscsiuio.service                           disabled 
iscsid.socket                              disabled 
iscsiuio.socket                            disabled 

### 서버 재기동 

# iscsiadm -m session
tcp: [1] 200.200.10.181:3260,1 iqn.2024-02.com.data:test-data (non-flash)
tcp: [2] 200.200.10.181:3260,1 iqn.2024-02.com.sbd:test-sbd (non-flash)

# iscsiadm -m node
200.200.10.181:3260,1 iqn.2024-02.com.data:test-data
200.200.10.181:3260,1 iqn.2024-02.com.sbd:test-sbd

iscsi disable / iscsid enable

# systemctl list-unit-files  | grep iscsi
iscsi-onboot.service                       disabled 
iscsi-shutdown.service                     static   
iscsi.service                              disabled 
iscsid.service                             enabled  
iscsiuio.service                           disabled 
iscsid.socket                              enabled  
iscsiuio.socket                            disabled 

### 서버 재기동 

# iscsiadm -m session
iscsiadm: No active sessions.

# iscsiadm -m node
200.200.10.181:3260,1 iqn.2024-02.com.data:test-data
200.200.10.181:3260,1 iqn.2024-02.com.sbd:test-sbd

참고 문서 :
https://unix.stackexchange.com/questions/216239/iscsi-vs-iscsid-services

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