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If we have pending config changes to be saved into the startup-config, then we must pay attention when we save the configuration as these two slightly similar actions have different outcomes. This sequence order will correctly reflect all the changes after the reboot. Sonic# copy running-configuration startup-configuration Sonic# image install http://SONiC_EntStd_4.1.1.bin Sonic# reboot This sequence order will cause any nonsaved configuration changes into the startup-configuration to be lost after the reboot. Sonic# image install http://SONiC_EntStd_4.1.1.bin Sonic# copy running-configuration startup-configuration Sonic# reboot We will discuss why this happens in the next section.
When, we issue image install http://<DELL-SONIC-INSTALL-FILE.bin> to upgrade the following process happens. - The startup_config /etc/sonic/config_db.json is migrated into /host/old_config/config_db.json applying any required schema change in the config for the new version. - During the switch, reboot this configuration stored in /host/old_config/config_db.json is transferred to /etc/sonic/config_db.json after changes related to the new version are applied. Hence any pending changes saved after we run image install http://<DELL-SONIC-INSTALL-FILE.bin> will not be reflected into /host/old_config/config_db.json. In consequence this configuration change will be lost during the reboot.
There could be a few workarounds once you land into this situation, two of the easiest would be: Option 1 Boot the switch into the old SONiC version, delete the new version, and reinstall the new version again: Sonic# s how image list Sonic# i mage set-default <Old-SONIC version> Sonic# reboot When the switch comes back with the old version: Sonic# show image list Sonic# image remove <new-SONiC-version> Sonic# image install <http://new-SONIC version> Sonic# reboot NOTE: It is assumed the configuration was saved after image install command, successfully performed and before reboot. Sample output admin@sonic:~$ sonic-cli sonic# show image list Current: SONiC-OS-4.0.6-Enterprise_Standard Next: SONiC-OS-4.0.6-Enterprise_Standard Available: SONiC-OS-4.0.3-Enterprise_Base SONiC-OS-4.0.6-Enterprise_Standard sonic# image set-default SONiC-OS-4.0.3-Enterprise_Base sonic# reboot reboot in process ..... Waiting for the reboot operation to complete 11, 32, 15, 00068001, 19, 00068000, When the switch comes back: sonic login: admin Password: Last login: Wed Oct 4 10:10:30 UTC 2023 on ttyS0 Linux sonic 4.19.0-9-2-amd64 #1 SMP Debian 4.19.118-2+deb10u1 (2020-06-07) x86_64 You are on ____ ___ _ _ _ ____ / ___| / _ \| \ | (_)/ ___| \___ \| | | | \| | | | ___) | |_| | |\ | | |___ |____/ \___/|_| \_|_|\____|-- Software for Open Networking in the Cloud --Unauthorized access and/or use are prohibited. All access and/or use are subject to monitoring.Help: http://azure.github.io/SONiC/admin@sonic:~$ sonic-cli sonic# show image list Current: SONiC-OS-4.0.3-Enterprise_Base Next: SONiC-OS-4.0.3-Enterprise_Base Available: SONiC-OS-4.0.3-Enterprise_Base SONiC-OS-4.0.6-Enterprise_Standard sonic# image remove SONiC-OS-4.0.6-Enterprise_Standard Remove image SONiC-OS-4.0.6-Enterprise_Standard? [y/N]:y sonic# show image list Current: SONiC-OS-4.0.3-Enterprise_Base Next: SONiC-OS-4.0.3-Enterprise_Base Available: SONiC-OS-4.0.3-Enterprise_Base sonic# image install http://10.24.30.105/software/Dell%20EMC/Networ king/SONiC_EntStd_4.0.6.bin %Info: Check 'show image status' for image install progress. sonic# show image status ----------------------------------------------------------- Global operation status : GLOBAL_STATE_SUCCESS ----------------------------------------------------------- File operation status : TRANSFER_STATE_SUCCESS File size(bytes) : 1055807512 File transfer bytes : 1055807512 File progress : 100% Transfer start time : 2023-10-04 10:17:40+0000 Transfer end time : 2023-10-04 10:17:49+0000 ----------------------------------------------------------- Install operation status : INSTALL_STATE_SUCCESS Install start time : 2023-10-04 10:17:49+0000 Install end time : 2023-10-04 10:18:26+0000 sonic# show image list Current: SONiC-OS-4.0.3-Enterprise_Base Next: SONiC-OS-4.0.6-Enterprise_Standard Available: SONiC-OS-4.0.3-Enterprise_Base SONiC-OS-4.0.6-Enterprise_Standard sonic# reboot Option 2 Apply the missing configuration in the new SONiC OS. NOTE: If we attempt to copy the config_db.json from the old partition into the new partition, we may land into other issues as the config file’s schema may have changed between the versions.
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