Version pre 2.x of keepalive which are shipped with the Ubuntu18 Repository will crash. You'll have to configure a higher Version from source by yourself.

https://github.com/acassen/keepalived/issues/836

https://www.keepalived.org/download.html

"/lib/systemd/system/keepalived.service"

[Unit]
Description=LVS and VRRP High Availabi...

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https://docs.netgate.com/pfsense/en/latest/interfaces/low-throughput-troubleshooting.html

For e.g. deactivate "Hardware Checksum Offloading check" tweeks the performance.

in an opnsense you'll find it under interface -> settings

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So, here is how I resized my ext4 root partition (sda2) using gdisk and resize2fs:

$ gdisk /dev/sda

Print information (i2)
Partition GUID code: 0FC63DAF-8483-4772-8E79-3D69D8477DE4 (Linux filesystem)
Partition unique GUID: 7FAC4BC8-6186-4CDF-B6CA-EB73D7C942D1
First sector: 206848 (at 101.0 MiB)
Last sector: 109051903 (at 52.0 Gi...

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du -h --max-depth=1 / | grep '[0-9]G\>' | sort -hr

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Just remove the tc.log File and afterwards the mariadb.service will start.

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