I upgraded to 20.04 and during the setup answered N to all the prompts to overwrite config files with new version such as Maria DB and after the upgrade I can pull up the webpage for librenms, but it is apparently unable to connect to the DB. The error I get is below. I looked through similar topics from 16.04 to 18.04, but it doesn’t seem to be relevant because I get an error when I attempt the solution. Does anyone know how to solve this?
:/var/log$ sudo apt install curl composer fping git graphviz imagemagick mariadb-client mariadb-server mtr-tiny nginx-full nmap php7.2-cli php7.2-curl php7.2-fpm php7.2-gd php7.2-json php7.2-mbstring php7.2-mysql php7.2-snmp php7.2-xml php7.2-zip python-memcache python-mysqldb rrdtool snmp snmpd whois
Reading package lists… Done
Building dependency tree
Reading state information… Done
Package php7.2-snmp is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package ‘php7.2-snmp’ has no installation candidate
ERROR:
Error connecting to database
SQLSTATE[HY000] [2002] No such file or directory
Check your log for more details. (librenms.log)
If you need additional help, you can find how to get help at https://docs.librenms.org/Support.
Why are you trying to install php7.2? I thought ubuntu 20.04 has the packages for php7.4? I know php7.2 will be dropped from librenms soon (or so validate.php tells me).
I was following a similar thread where they had a DB issue from 16.04 - 18.04 since I couldn’t find my exact scenario. I’m not familiar with how the app is built or its dependencies. I was just trying to find a way to get it working again.
Any ideas?
Let me revise this question. Is there anyway I can take a backup, reinstall and restore? Or is it possible the DB completely got wiped out with a Ubuntu upgrade? This is just for a home network instance, but I’d hate to have to start from scratch again if avoidable.
My backup of the VM is too old to restore and will affect multiple other things. I’m aware I should have had a more recent backup before install, but I performed the upgrade only because Ubuntu kept crashing as a troubleshooting step.
Sorry for the very late reply (work this past month kept me too busy). I performed the exact upgrade you did and got the same results. I did manage to get it to work but the process was pretty ugly. After the system upgrade, I followed the librenms install docs for 20.04, re-modifying the (new) config files (php7.4-fpm, php7.4-cli, nginx config, etc). Once that was done, I had to manually run daily.sh to get the current codebase (now that I had php7.4). I have another librenms server to upgrade; I think I’ll backup the rrd files and the sql database and just do a clean install this time.
I forgot to add that simply upgrading the OS doesn’t install th newer packages (such as php7.4). You really need to re run the librenms install (which is why I think doing the upgrade as a clean install is the better, less stressful way to do this).
I successfully upgraded our lab Libre instance from Ubuntu 18.04 to 20.04 and it worked well for me. I did not run into any DB issues. However I did have to re-run through much of the Libre Ubuntu 20.04 install procedure to make it work after upgrading. I also ran into PHP version issues since I had manually added php7.4 before we upgraded to Ubuntu 20, and had to basically remove all PHP versions and then re-install Ubuntu 20 php7.4 from scratch.
Backup/snapshot your Libre instance before upgrading in case things go south and you need to roll back 
Here is my root ssh command history of the post-upgrade work that I did (with non-pertinent commands removed). Obviously this is not going to be exactly the same for everyone, but hopefully it gives an idea of what I had to to do make my upgrade successful.
1762 do-release-upgrade
1763 lsb_release -a
1764 php -v
1767 apt list --installed | grep php
1768 apt remove php7.0-common
1773 apt remove php7.2-common
1775 apt remove php7.3-common
1777 apt remove php7.4-common
1778 sudo apt autoremove
1779 apt list --installed | grep php
1782 apt update
1783 apt upgrade
1785 apt install php-fpm
1787 apt list --installed | grep php
1788 cd /opt/librenms/
1791 apt install php7.4-cli php7.4-curl php7.4-fpm php7.4-gd php7.4-json php7.4-mbstring php7.4-mysql php7.4-snmp php7.4-xml php7.4-zip
1792 su - librenms
1794 ./validate.php
1796 ./scripts/github-remove -d
1797 ./validate.php
1805 shutdown -r now
1806 vi /etc/php/7.4/cli/php.ini
1807 vi /etc/php/7.4/fpm/php.ini
1808 cd /opt/librenms/
1810 ./validate.php
1811 sudo chown -R librenms:librenms /opt/librenms
1812 sudo setfacl -d -m g::rwx /opt/librenms/rrd /opt/librenms/logs /opt/librenms/bootstrap/cache/ /opt/librenms/storage/
1813 sudo chmod -R ug=rwX /opt/librenms/rrd /opt/librenms/logs /opt/librenms/bootstrap/cache/ /opt/librenms/storage/
1814 ./validate.php
1816 cd /etc/php/7.4/fpm/pool.d/
1818 cp /etc/php/7.4/fpm/pool.d/www.conf /etc/php/7.4/fpm/pool.d/librenms.conf
1820 vi librenms.conf
1829 rm www.conf
1835 cd /etc/nginx/conf.d/
1837 vi librenms.conf
1840 systemctl restart nginx
1841 systemctl restart php7.4-fpm
1847 vi /etc/php/7.4/fpm/pool.d/librenms.conf
1848 systemctl restart php7.4-fpm
1849 systemctl restart nginx
1854 cd /opt/librenms/logs/
1860 less access_log
1861 less error_log
1872 vi /etc/php/7.4/fpm/pool.d/librenms.conf
1874 systemctl restart nginx
1878 systemctl status oxidized
1879 add-apt-repository universe
1880 apt-get install ruby ruby-dev libsqlite3-dev libssl-dev pkg-config cmake libssh2-1-dev libicu-dev zlib1g-dev g++
1881 gem install oxidized
1882 gem install oxidized-script oxidized-web
1883 cd /var/lib/gems/2.7.0/gems/oxidized-script-0.6.0/lib/oxidized/script
1897 chmod 775 cli.rb
1903 systemctl restart oxidized
1904 systemctl status oxidized
1905 apt install php-ldap
1908 ./scripts/auth_test.php -d -v -u user1
Output of validate.php after the upgrade work:
$ ./validate.php
| Component |
Version |
| LibreNMS |
1.69 |
| DB Schema |
2020_10_21_124101_allow_nullable_ospf_columns (188) |
| PHP |
7.4.3 |
| Python |
3.8.5 |
| MySQL |
10.3.25-MariaDB-0ubuntu0.20.04.1 |
| RRDTool |
1.7.2 |
| SNMP |
NET-SNMP 5.8 |
| OpenSSL |
|
====================================
[OK] Composer Version: 1.10.17
[OK] Dependencies up-to-date.
[OK] Database connection successful
[OK] Database schema correct