OS - FAQ
- We are planning to update the Linux OS kernel, but how can we check if the Linux version of the Agent supports it?ECL2.0, OS
Various DSA versions and kernel support packages are released after evaluation and review by us.
Therefore, it may be used later than the vendor's release.
To update the kernel, please visit the vendor site (*1) and the HBS WebUI screen
[Administration] > [Updates] > [Software] > [Local] and check the available kernels(*2) before updating.
[9.x/10.x/11.x/12.x] Supported Linux Kernels
Please export and unpack the latest publicly available kernel support package and check to see if the version of the kernel you want to use is included.
If you can confirm that it is included, you can continue working on it.
If it is not included, contact us via the Enterprise Cloud 2.0 ticket system.
- Is the redundant method available that uses the same IP address with different MAC addresses including the Windows Server Failover Cluster?ECL2.0, OS, Virtual Server
We have confirmed that Windows Server Failover Cluster works under our verification environment.
As of July 2019, we have confirmed the operation with the next version.
- Windows Server 2012 R2
- Windows Server 2016
* Since the DAD function is disabled in the official image template of the virtual server, please follow the procedure below when using a failover cluster with a virtual server.
1. Input "regedt32" in search box on Start menu and enter.
2. Click "HKEYLOCAL MACHINE" in Registry Editor.
3. Click "System" -> "CurrentControlSet" -> "Services" -> "TcpIp" -> "Parameters".
4. Right-click "Parameters" and click "New" -> "DWORD(32-bit)Value".
5. Delete "New Value #1", right-click "ArpRetryCount" and click "Delete".
6. Reboot the virtual server.
- The disk has been changed to Read Only on Red Hat Enterprise Linux (or CentOS / Ubuntu). How should I take actions?ECL2.0, OS
If a problem (such as an "I/O" error) occurs during disk access to a device, the file system of a device mounted in a specific directory might be forced to be remounted with Read-Only because it is determined that a problem has occurred with the file system of the device. In this case, you can remount the file system of the device mounted in a specific directory with Read Write according to below steps.
1.Check the file system of the device mounted with Read Only (in the example below, you can confirm that "/dev/vdb" is mounted with Read-Only)
# mount -l /dev/mapper/rhel-root on / type xfs (rw,relatime,attr2,inode64,noquota) /dev/mapper/rhel-var on /var type xfs (rw,relatime,attr2,inode64,noquota) /dev/vda1 on /boot types xfs (rw,relatime,attr2,inode64,noquota) /dev/vdb on /mnt types xfs (ro,relatime,attr2,inode64,noquota) ※ ro = read only
2.Remount the file system of the device with Read Write (In the example below, "/dev/vdb" has been remounted with Read Write)
# mount -o remount,rw /dev/vdb # mount -l /dev/mapper/rhel-root on / type xfs (rw,relatime,attr2,inode64,noquota) /dev/mapper/rhel-var on /var type xfs (rw,relatime,attr2,inode64,noquota) /dev/vda1 on /boot types xfs (rw,relatime,attr2,inode64,noquota) /dev/vdb on /mnt types xfs (rw,relatime,attr2,inode64,noquota) ※ rw = read write
- Red Hat Enterprise Linux (or CentOS) does not boot.ECL2.0, OS
Follow the steps below to acquire boot logs to investigate why Red Hat Enterprise Linux (or CentOS) does not boot.
1. Boot Red Hat Enterprise Linux (or CentOS) in rescue mode.
2. Execute the following command to acquire the boot logs.
# journalctl -xb | less
If the following logs exist in Red Hat Enterprise Linux (or CentOS) boot logs, the description of "/etc/ fstab" is not appropriate.
By commenting out or deleting the line where the description of "/etc / fstab" is not appropriate, you could normally boot Red Hat Enterprise Linux (or CentOS).
(e.g.) The mount option is not specified properly in "/etc/fstab".
Jan 01 00:00:00 localhost systemd: Mounting /mnt... Jan 01 00:00:00 localhost mount: mount: wrong fs type, bad option, bad superblock on /mnt, Jan 01 00:00:00 localhost mount: missing codepage or helper program, or other error Jan 01 00:00:00 localhost mount: In some cases useful info is found in syslog - try Jan 01 00:00:00 localhost mount: dmesg | tail or so. Jan 01 00:00:00 localhost kernel: XFS (vdb): unknown mount option [default]. ※ There is a description of non-existent mount option "default" in "/etc/fstab". Jan 01 00:00:00 localhost systemd: mnt.mount mount process exited, code=exited status=32 Jan 01 00:00:00 localhost systemd: Failed to mount /mnt.
(e.g.) The device is not specified properly in "/etc/fstab".
Jan 01 00:00:00 localhost systemd: Job dev-vdc.device/start timed out. ※ There is a description of non-existent device "/dev/vdc" in "/etc/fstab".
- What is the procedure for booting in rescue mode on RHEL (or CentOS)?ECL2.0, OS
The procedure for booting RHEL (or CentOS) currently in use on a virtual server in rescue mode is as follows.
1. Log in to the cloud computing control panel.
2. Go ahead [Server]-[Virtual Server]-[Instance]-[Console] and open the console screen of the virtual server instance.
3. Press [Send CtrlAltDelete] button on the console screen.
4. Press [e] key on the GRUB Boot screen (OS selection screen for booting) immediately after starting the virtual server instance.
5. Delete "console = ttyS0 console = ttyS1,115200n8 quiet" at the end of the line starting with "linux16" on the edit screen, enter "systemd.unit = rescue.target" and enter "Ctrl" "x" at the same time.
# When using the Japanese keyboard, it may be difficult to enter "=". In this case, please leave "=" when deleting "console = ttyS0 console = ttyS1,115200n8 quiet".
6. Log in using the root user password on the Red Hat Enterprise Linux or CentOS login screen.
Red Hat - Product Documentation
- Is the SID (Security Identifier) of Windows Server changed by snapshot duplication or system restore of the backup menu?ECL2.0, OS, Virtual Server
- Is it possible to use Windows Server from private ISO on Virtual Server?ECL2.0, OS, Virtual Server
- Is Internet connection required for Windows Update on barematal server or virtual server?ECL2.0, OS
Yes. Please apply for Internet connectivity if you want to execute Windows Update on baremetal server or virtual server.
- How do I set the language setting to Japanese on Windows OS?ECL2.0, OS
If you want to set the OS Language setting to Japanese, you can set it from the OS control panel yourself.
From the OS control panel, you can change the OS Language setting to Japanese in Add Language.
Reference: Service Descriptions - Windows Server
Although it becomes the specification of Microsoft Corporation, after the installation of the OS image, the process of automatically and periodically deleting unused Language Packs in the Windows OS is running, and this process might have deleted the Japanese package.
When deletion is executed, you can find the following log; "Package language pack was successfully changed to Absent state."
At first, please check whether Japanese pack exists or not in the Language Pack. If Japanese pack does not exist in the Language Pack, please download it after setting your server connected to the Internet.
- How can I perform yum update on a server created from RHEL official image template?ECL2.0, OS
Please confirm the following 3 points.
Please confirm the connectivity from the virtual server to "169.254.127.24".
"169.254.127.24" is the IP of RHUI provided in the common function pool.
("169.254.127.24" is the download destination of yum update in RedhatOS provided by NTT Com as an official template.)
Please check "/etc /hosts".
If there is no setting required for name resolution of the target repository server, it is necessary to add the setting.
The following settings are required in "/ etc / hosts" of the target VM.
169.254.127.24 rhcds-sr-vip-(region).ecl.ntt.com.local ex) If your region is DE1 169.254.127.24 rhcds-sr-vip-de1.ecl.ntt.com.local
Since April 2018, the repository server of yum has become new, and customers need to change the setting on the server's guest OS.
Please refer to the following for details.