Verifying the Checksum
When you stage an image on a device by using Junos Space Network Management Platform, sometimes the device image is not completely transferred to the device. Verifying the checksum helps validate that the device image is staged properly and is not corrupted or altered in any way from the device image that you staged from the Junos Space server.
The checksum value is a 32-character hexadecimal number that is computed for the device image file on the device. The device image file is validated by verifying whether the checksum values stored on the Junos Space server and the device match. If the checksum values match, the device image is considered to be copied correctly.
You can verify the checksum of satellite software packages and Junos Continuity software packages by following the procedure for verifying the checksum of device images.
To verify the checksum:
- On the Junos Space Network Management Platform UI, select Images and Scripts > Images.
The Images page appears.
- Select the image whose checksum you want to verify.
- Select Verify Image on Devices from the Actions
This option is unavailable if you select multiple images for verifying the checksum. Select only one image and repeat this step.
The Verifying checksum of image on device(s) page appears. This page displays the following information:
Image name—Name of the image, which you have selected for verifying the checksum
MD5 Value—32-character hexadecimal number that is computed on the selected device image file, which is stored on the Junos Space server
Host Name—Name of the discovered device, which is an identifier used for network communication between Junos Space Network Management Platform and the Junos OS device
Device Alias—Value of the Device Alias custom label for the device. This field is empty if the Device Alias custom label is not added or no value is assigned to the Device Alias custom label for the device.
IP Address—IP address of the discovered device
Platform—Platform of the discovered device
Serial Number—Serial number of the device
Software Version—Operating system firmware version running on the device
Staged Status—Indicates whether the selected image is staged on the discovered device. This column displays either Staged (if the image is staged) or Not Staged (if the image is not yet staged).
Deployed Status—Indicates whether the selected Junos Continuity software package is deployed on the device. This column appears only when you select a Junos Continuity software package for verifying the checksum. The column displays either Deployed (if the Junos Continuity software package is deployed) or Undeployed (if the Junos Continuity software package is not deployed).
Checksum Status—Indicates whether the device image on the Junos Space server and the device are the same. The status can be one of the following:
Valid when the checksum values of the device image on the Junos Space server and the device match
Invalid when the checksum values of the device image on the Junos Space server and the device do not match
NA when the selected image is not staged on the device yet
Last Checksum Time—Time when the checksum was last verified. For a device in which the selected image is not staged yet, this column displays NA. This column is updated when an image is restaged to the device.
- Select the devices that have the device image staged on
them by using one of the following selection modes—manually,
on the basis of tags, or by using a comma-separated values (CSV) file.
These options are mutually exclusive. If you select one, the others
Perform a validation on those devices where the Checksum Status column shows Valid but the Last Checksum Time column displays a time that is way past the current time. By performing this action, you ensure that the image on the devices is valid currently.
By default, the Select by Device option is selected and the complete list of devices is displayed.
To select devices manually:
- Click the Select Device Manually option, if it is not selected previously.
- Select the devices on which you want to verify the checksum.
The Select Devices status bar shows the total number of devices that you selected. The status bar is dynamically updated as you select the devices.
- To select all devices, select the check box in the column header next to Host Name.
To select devices on the basis of tags:
- Click the Select by Tags option.
The Select by tags list is activated.
- Click the arrow on the Select by Tags list.
A list of tags defined on devices in the Junos Space system appears, displaying two categories of tags—Public and Private.
If no tags are displayed, then it means that none of the devices is associated with any tag. You need to tag the devices on the Device Management page before you can use the Select by Tags option.
- To select tags, perform one of the following actions :
Select the check boxes next to the tag names to select the desired tags and click OK.
To search for a specific tag, enter the first few letters of the tag name in the Select by Tags field to the left of the OK button. If a match is found, a suggestion is made. Select the suggested match and click OK.
As you select the tags, the total number of devices associated with the selected tags appears just above the device display table. For example, if there are six devices associated with the selected tags, then 6 items selected is displayed.
The selected tags appear next to the Tags Selected label. An [X] icon appears after each tag name. You can click the [X] icon to clear any tag from the list. The device count decrements accordingly.
The device display table displays the devices associated with the selected tags.
From Junos Space Platform Release 17.2R1 onward, when you select devices by CSV, you can choose to select all managed devices. Select the Include All Managed Devices check box to list all managed devices for selection.
To select devices by using a CSV file:
- Select the Select by CSV option.
- Click Browse to navigate to the file location
in your local system and select the CSV file containing the list of
devices on which you want to verify the device image.
For a sample CSV file, click the Sample CSV link. You are prompted to save the file. Save the file to your local system and open it by using an application, such as Microsoft Excel.
- Click Upload to upload the CSV file.
From Release 16.1R2 onward, when you upload a CSV file to select devices from, Junos Space Platform verifies the devices in the CSV file. If the CSV file contains devices to which the changes do not apply, a warning message appears which says Few devices are not selected due to precondition failure. Please click "View inapplicable devices" for more details.
You can click the View inapplicable devices link to review the list of devices that are excluded from the update. The reason for exclusion is listed as an error message against each device.
- (Optional) To schedule a time for verifying the checksum, select the Schedule at a later time check box and use the calendar icon and drop-down list to specify the date and time respectively.
- Click Verify.
The checksum value of the device image file on the Junos Space server is validated against the checksum value of the device image file stored on the selected devices. An alert appears, displaying the job ID.
To verify the devices on which the checksum status is valid, click the job ID link or navigate to the Job Management page and view the status of the job. If the job is a success, then the checksum values match on all devices selected for verification. However, if the job is a failure, double-click the row corresponding to the job to identify the devices on which this job is a failure. The Device Image Action Details displays the reason for failure in the Description column. Validation may fail if the checksum values do not match and for other reasons such as when the image is not staged on the device.
Also, you can export information from the Device Image Action Details page as a CSV file to your local system.
To export data from the Device Image Action Details page to your local system:
- Click Export as CSV.
You are prompted to save the file.
- Click OK in the File Save page to save the file to your local file system.
- Click OK in the Exporting Device Image Job page, to return to the Job Management page.
Use an application such as Microsoft Excel to open the downloaded file from your local system. If you are using Microsoft Excel, you can filter data in the Status column to identify the devices on which the image verification failed.
- Click Export as CSV.
When you verify a checksum, an audit log entry is automatically generated.