It’s just silently falling over and restarting when trying to start with brew services start postgresql
New-MacBook-Pro:local cex$ sudo -s tail -f /var/log/system.log Password: Feb 19 09:52:41 New-MacBook-Pro com.apple.xpc.launchd (homebrew.mxcl.postgresql): Service exited with abnormal code: 1 Feb 19 09:52:41 New-MacBook-Pro com.apple.xpc.launchd (homebrew.mxcl.postgresql): Service only ran for 0 seconds. Pushing respawn out by 10 seconds. Feb 19 09:52:51 New-MacBook-Pro com.apple.xpc.launchd (homebrew.mxcl.postgresql): Service exited with abnormal code: 1
Starting manually and checking the server.log
New-MacBook-Pro:local cex$ pg_ctl -D /usr/local/var/postgres -l /usr/local/var/postgres/server.log start waiting for server to start.... stopped waiting pg_ctl: could not start server Examine the log output. New-MacBook-Pro:local cex$ cat /usr/local/var/ cache/ db/ homebrew/ lib/ log/ mongodb/ mysql/ postgres/ run/ New-MacBook-Pro:local cex$ cat /usr/local/var/postgres/server.log 2019-02-19 10:00:29.473 GMT  FATAL: database files are incompatible with server 2019-02-19 10:00:29.473 GMT  DETAIL: The data directory was initialized by PostgreSQL version 10, which is not compatible with this version 11.1.
Ok, so data dir is incompatible. Damn. Hopefully I can just upgrade the data files with brew postgresql-upgrade-database
New-MacBook-Pro:local cex$ brew postgresql-upgrade-database ==> brew install postgresql@10 ==> Downloading https://firstname.lastname@example.org_1.mojave.bottle.1.tar.gz ######################################################################## 100.0% ==> Pouring email@example.com_1.mojave.bottle.1.tar.gz ==> /usr/local/Cellar/postgresql@10/10.6_1/bin/initdb /usr/local/var/postgresql@10 ==> Caveats To migrate existing data from a previous major version of PostgreSQL run: brew postgresql-upgrade-database postgresql@10 is keg-only, which means it was not symlinked into /usr/local, because this is an alternate version of another formula. If you need to have postgresql@10 first in your PATH run: echo 'export PATH="/usr/local/opt/postgresql@10/bin:$PATH"' >> ~/.bash_profile For compilers to find postgresql@10 you may need to set: export LDFLAGS="-L/usr/local/opt/postgresql@10/lib" export CPPFLAGS="-I/usr/local/opt/postgresql@10/include" For pkg-config to find postgresql@10 you may need to set: export PKG_CONFIG_PATH="/usr/local/opt/postgresql@10/lib/pkgconfig" To have launchd start postgresql@10 now and restart at login: brew services start postgresql@10 Or, if you don't want/need a background service you can just run: pg_ctl -D /usr/local/var/postgresql@10 start ==> Summary /usr/local/Cellar/postgresql@10/10.6_1: 1,706 files, 20.8MB ==> Upgrading postgresql data from 10 to 11... Stopping `postgresql`... (might take a while) ==> Successfully stopped `postgresql` (label: homebrew.mxcl.postgresql) waiting for server to start....2019-02-19 10:05:34.199 GMT  LOG: listening on IPv6 address "::1", port 5432 2019-02-19 10:05:34.199 GMT  LOG: listening on IPv4 address "127.0.0.1", port 5432 2019-02-19 10:05:34.200 GMT  LOG: listening on Unix socket "/tmp/.s.PGSQL.5432" 2019-02-19 10:05:34.219 GMT  LOG: database system was shut down at 2019-02-07 21:30:24 GMT 2019-02-19 10:05:34.223 GMT  LOG: database system is ready to accept connections done server started waiting for server to shut down....2019-02-19 10:05:34.362 GMT  LOG: received fast shutdown request 2019-02-19 10:05:34.362 GMT  LOG: aborting any active transactions 2019-02-19 10:05:34.363 GMT  LOG: worker process: logical replication launcher (PID 32611) exited with exit code 1 2019-02-19 10:05:34.363 GMT  LOG: shutting down 2019-02-19 10:05:34.369 GMT  LOG: database system is shut down done server stopped ==> Moving postgresql data from /usr/local/var/postgres to /usr/local/var/postgres.old... The files belonging to this database system will be owned by user "cex". This user must also own the server process. The database cluster will be initialized with locale "en_US.UTF-8". The default database encoding has accordingly been set to "UTF8". The default text search configuration will be set to "english". Data page checksums are disabled. fixing permissions on existing directory /usr/local/var/postgres ... ok creating subdirectories ... ok selecting default max_connections ... 100 selecting default shared_buffers ... 128MB selecting dynamic shared memory implementation ... posix creating configuration files ... ok running bootstrap script ... ok performing post-bootstrap initialization ... ok syncing data to disk ... ok WARNING: enabling "trust" authentication for local connections You can change this by editing pg_hba.conf or using the option -A, or --auth-local and --auth-host, the next time you run initdb. Success. You can now start the database server using: /usr/local/opt/postgresql/bin/pg_ctl -D /usr/local/var/postgres -l logfile start Performing Consistency Checks ----------------------------- Checking cluster versions ok Checking database user is the install user ok Checking database connection settings ok Checking for prepared transactions ok Checking for reg* data types in user tables ok Checking for contrib/isn with bigint-passing mismatch ok Creating dump of global objects ok Creating dump of database schemas ok Checking for presence of required libraries ok Checking database user is the install user ok Checking for prepared transactions ok If pg_upgrade fails after this point, you must re-initdb the new cluster before continuing. Performing Upgrade ------------------ Analyzing all rows in the new cluster ok Freezing all rows in the new cluster ok Deleting files from new pg_xact ok Copying old pg_xact to new server ok Setting next transaction ID and epoch for new cluster ok Deleting files from new pg_multixact/offsets ok Copying old pg_multixact/offsets to new server ok Deleting files from new pg_multixact/members ok Copying old pg_multixact/members to new server ok Setting next multixact ID and offset for new cluster ok Resetting WAL archives ok Setting frozenxid and minmxid counters in new cluster ok Restoring global objects in the new cluster ok Restoring database schemas in the new cluster ok Copying user relation files ok Setting next OID for new cluster ok Sync data directory to disk ok Creating script to analyze new cluster ok Creating script to delete old cluster ok Upgrade Complete ---------------- Optimizer statistics are not transferred by pg_upgrade so, once you start the new server, consider running: ./analyze_new_cluster.sh Running this script will delete the old cluster's data files: ./delete_old_cluster.sh ==> Upgraded postgresql data from 10 to 11! ==> Your postgresql 10 data remains at /usr/local/var/postgres.old ==> Successfully started `postgresql` (label: homebrew.mxcl.postgresql)
Fortunately that seems to have worked.