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====== Upgrade Zabbix ======
===== Upgrade PostgreSQL =====

==== Checando o PostgreSQL Atual ====
<file bash>
$ sudo su - postgres
$ psql
</file>

<file bash>
# select version();
                                                 version
---------------------------------------------------------------------------------------------------------
 PostgreSQL 13.7 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-10), 64-bit
(1 row)
</file>

<file bash>
# \db+
                                    List of tablespaces
    Name    |  Owner   |   Location    | Access privileges | Options |  Size  | Description
------------+----------+---------------+-------------------+---------+--------+-------------
 pg_default | postgres |               |                   |         | 23 MB  |
 pg_global  | postgres |               |                   |         | 567 kB |
 tbzabbix   | postgres | /pgsql/zabbix |                   |         | 46 MB  |
</file>

<file bash>
# \l+
                                                                    List of databases
   Name    |  Owner   | Encoding |   Collate   |    Ctype    |   Access privileges   |  Size   | Tablespace |                Description
-----------+----------+----------+-------------+-------------+-----------------------+---------+------------+--------------------------------------------
 postgres  | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 |                       | 7925 kB | pg_default | default administrative connection database
 template0 | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/postgres          +| 7753 kB | pg_default | unmodifiable empty database
           |          |          |             |             | postgres=CTc/postgres |         |            |
 template1 | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/postgres          +| 7753 kB | pg_default | default template for new databases
           |          |          |             |             | postgres=CTc/postgres |         |            |
 zabbix    | zabbix   | UTF8     | en_US.UTF-8 | en_US.UTF-8 |                       | 46 MB   | tbzabbix   |
(4 rows)
</file>

<file bash>
# \du+
                                          List of roles
 Role name |                         Attributes                         | Member of | Description
-----------+------------------------------------------------------------+-----------+-------------
 postgres  | Superuser, Create role, Create DB, Replication, Bypass RLS | {}        |
 zabbix    |                                                            | {}        |
</file>

==== Fazendo upgrade do PostgreSQL ====

<file bash>
$ sudo dnf install postgresql14-server postgresql14-contrib timescaledb-2-postgresql-14
</file>

<file bash>
$ sudo postgresql-14-setup initdb
</file>

<file bash>
$ sudo vim /var/lib/pgsql/14/data/postgresql.conf
[...]
#port = 5432                            # (change requires restart)
port = 5433                             # (change requires restart)
[...]
</file>

<file bash>
$ sudo systemctl start postgresql-14
</file>

<file bash>
$ sudo su - postgres
$ psql -p 5433
</file>

<file bash>
# select version();
                                                 version
---------------------------------------------------------------------------------------------------------
 PostgreSQL 14.4 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-10), 64-bit
(1 row)

postgres=# show port;
 port
------
 5433
(1 row)

postgres=# \l
                                  List of databases
   Name    |  Owner   | Encoding |   Collate   |    Ctype    |   Access privileges
-----------+----------+----------+-------------+-------------+-----------------------
 postgres  | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 |
 template0 | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/postgres          +
           |          |          |             |             | postgres=CTc/postgres
 template1 | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/postgres          +
           |          |          |             |             | postgres=CTc/postgres
(3 rows)

postgres=# \du
                                   List of roles
 Role name |                         Attributes                         | Member of
-----------+------------------------------------------------------------+-----------
 postgres  | Superuser, Create role, Create DB, Replication, Bypass RLS | {}
</file>

<file bash>
postgres=# \q
$ ps -ef | grep postmaster
postgres    6869       1  0 19:41 ?        00:00:01 /usr/pgsql-13/bin/postmaster -D /var/lib/pgsql/13/data/
postgres   10188       1  0 20:51 ?        00:00:00 /usr/pgsql-14/bin/postmaster -D /var/lib/pgsql/14/data/
postgres   10381   10222  0 20:55 pts/0    00:00:00 grep --color=auto postmaster
</file>

<file bash>
$ /usr/pgsql-13/bin/pg_ctl -D /var/lib/pgsql/13/data status
pg_ctl: server is running (PID: 6869)
/usr/pgsql-13/bin/postgres "-D" "/var/lib/pgsql/13/data/"
</file>

<file bash>
$ /usr/pgsql-14/bin/pg_ctl -D /var/lib/pgsql/14/data status
pg_ctl: server is running (PID: 10188)
/usr/pgsql-14/bin/postgres "-D" "/var/lib/pgsql/14/data/"
</file>

<file bash>
$ /usr/pgsql-13/bin/pg_ctl -D /var/lib/pgsql/13/data stop
waiting for server to shut down.... done
server stopped
</file>

<file bash>
$ /usr/pgsql-14/bin/pg_ctl -D /var/lib/pgsql/14/data stop
waiting for server to shut down.... done
server stopped
</file>

<file bash>
$ /usr/pgsql-14/bin/pg_upgrade --help
pg_upgrade upgrades a PostgreSQL cluster to a different major version.

Usage:
  pg_upgrade [OPTION]...

Options:
  -b, --old-bindir=BINDIR       old cluster executable directory
  -B, --new-bindir=BINDIR       new cluster executable directory (default
                                same directory as pg_upgrade)
  -c, --check                   check clusters only, don't change any data
  -d, --old-datadir=DATADIR     old cluster data directory
  -D, --new-datadir=DATADIR     new cluster data directory
  -j, --jobs=NUM                number of simultaneous processes or threads to use
  -k, --link                    link instead of copying files to new cluster
  -o, --old-options=OPTIONS     old cluster options to pass to the server
  -O, --new-options=OPTIONS     new cluster options to pass to the server
  -p, --old-port=PORT           old cluster port number (default 50432)
  -P, --new-port=PORT           new cluster port number (default 50432)
  -r, --retain                  retain SQL and log files after success
  -s, --socketdir=DIR           socket directory to use (default current dir.)
  -U, --username=NAME           cluster superuser (default "postgres")
  -v, --verbose                 enable verbose internal logging
  -V, --version                 display version information, then exit
  --clone                       clone instead of copying files to new cluster
  -?, --help                    show this help, then exit

Before running pg_upgrade you must:
  create a new database cluster (using the new version of initdb)
  shutdown the postmaster servicing the old cluster
  shutdown the postmaster servicing the new cluster

When you run pg_upgrade, you must provide the following information:
  the data directory for the old cluster  (-d DATADIR)
  the data directory for the new cluster  (-D DATADIR)
  the "bin" directory for the old version (-b BINDIR)
  the "bin" directory for the new version (-B BINDIR)

For example:
  pg_upgrade -d oldCluster/data -D newCluster/data -b oldCluster/bin -B newCluster/bin
or
  $ export PGDATAOLD=oldCluster/data
  $ export PGDATANEW=newCluster/data
  $ export PGBINOLD=oldCluster/bin
  $ export PGBINNEW=newCluster/bin
  $ pg_upgrade

Report bugs to <pgsql-bugs@lists.postgresql.org>.
PostgreSQL home page: <https://www.postgresql.org/>
</file>

===== Upgrade do timescaledb =====

<file bash>
$ timescaledb-tune --pg-config=/usr/pgsql-14/bin/pg_config
Using postgresql.conf at this path:
/var/lib/pgsql/14/data/postgresql.conf

Is this correct? [(y)es/(n)o]: y
Writing backup to:
/tmp/timescaledb_tune.backup202207191237

shared_preload_libraries needs to be updated
Current:
#shared_preload_libraries = ''
Recommended:
shared_preload_libraries = 'timescaledb'
Is this okay? [(y)es/(n)o]: y
success: shared_preload_libraries will be updated

Tune memory/parallelism/WAL and other settings? [(y)es/(n)o]: y
Recommendations based on 3.56 GB of available memory and 2 CPUs for PostgreSQL 14

Memory settings recommendations
Current:
shared_buffers = 128MB
#effective_cache_size = 4GB
#maintenance_work_mem = 64MB
#work_mem = 4MB
Recommended:
shared_buffers = 932008kB
effective_cache_size = 2730MB
maintenance_work_mem = 466004kB
work_mem = 9320kB
Is this okay? [(y)es/(s)kip/(q)uit]: y
success: memory settings will be updated

Parallelism settings recommendations
Current:
missing: timescaledb.max_background_workers
#max_worker_processes = 8
#max_parallel_workers_per_gather = 2
#max_parallel_workers = 8
Recommended:
timescaledb.max_background_workers = 8
max_worker_processes = 13
max_parallel_workers_per_gather = 1
max_parallel_workers = 2
Is this okay? [(y)es/(s)kip/(q)uit]: y
success: parallelism settings will be updated

WAL settings recommendations
Current:
#wal_buffers = -1
min_wal_size = 80MB
Recommended:
wal_buffers = 16MB
min_wal_size = 512MB
Is this okay? [(y)es/(s)kip/(q)uit]: y
success: WAL settings will be updated

Miscellaneous settings recommendations
Current:
#default_statistics_target = 100
#random_page_cost = 4.0
#checkpoint_completion_target = 0.9
max_connections = 100
#max_locks_per_transaction = 64
#autovacuum_max_workers = 3
#autovacuum_naptime = 1min
#effective_io_concurrency = 1
Recommended:
default_statistics_target = 500
random_page_cost = 1.1
checkpoint_completion_target = 0.9
max_connections = 50
max_locks_per_transaction = 64
autovacuum_max_workers = 10
autovacuum_naptime = 10
effective_io_concurrency = 256
Is this okay? [(y)es/(s)kip/(q)uit]: y
success: miscellaneous settings will be updated
Saving changes to: /var/lib/pgsql/14/data/postgresql.conf
</file>

<file bash>
$ /usr/pgsql-14/bin/pg_upgrade --old-datadir "/var/lib/pgsql/13/data" --new-datadir "/var/lib/pgsql/14/data" --old-bindir "/usr/pgsql-13/bin" --new-bindir "/usr/pgsql-14/bin"
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 system-defined composite types in user tables  ok
Checking for reg* data types in user tables                 ok
Checking for contrib/isn with bigint-passing mismatch       ok
Checking for user-defined encoding conversions              ok
Checking for user-defined postfix operators                 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
Checking for new cluster tablespace directories             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 oldest XID for new cluster                          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 delete old cluster                       ok
Checking for extension updates                              ok

Upgrade Complete
----------------
Optimizer statistics are not transferred by pg_upgrade.
Once you start the new server, consider running:
    /usr/pgsql-14/bin/vacuumdb --all --analyze-in-stages

Running this script will delete the old cluster's data files:
    ./delete_old_cluster.sh
</file>

<file bash>
$ vim 14/data/postgresql.conf
[...]
port = 5432                             # (change requires restart)
#port = 5433                            # (change requires restart)
[...]
</file>

<file bash>
$ /usr/pgsql-14/bin/pg_ctl -D /var/lib/pgsql/14/data start
waiting for server to start....2022-07-19 12:45:13.782 UTC [49292] LOG:  redirecting log output to logging collector process
2022-07-19 12:45:13.782 UTC [49292] HINT:  Future log output will appear in directory "log".
 done
server started
</file>

<file bash>
$ psql
psql (14.4)
Type "help" for help.

postgres=# select version();
                                                 version
---------------------------------------------------------------------------------------------------------
 PostgreSQL 14.4 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-10), 64-bit
(1 row)

postgres=# \l+
                                                                    List of databases
   Name    |  Owner   | Encoding |   Collate   |    Ctype    |   Access privileges   |  Size   | Tablespace |                Description
-----------+----------+----------+-------------+-------------+-----------------------+---------+------------+--------------------------------------------
 postgres  | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 |                       | 8569 kB | pg_default | default administrative connection database
 template0 | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/postgres          +| 8593 kB | pg_default | unmodifiable empty database
           |          |          |             |             | postgres=CTc/postgres |         |            |
 template1 | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | postgres=CTc/postgres+| 8569 kB | pg_default | default template for new databases
           |          |          |             |             | =c/postgres           |         |            |
 zabbix    | zabbix   | UTF8     | en_US.UTF-8 | en_US.UTF-8 |                       | 60 MB   | tbzabbix   |
(4 rows)

postgres=# \db+
                                    List of tablespaces
    Name    |  Owner   |   Location    | Access privileges | Options |  Size  | Description
------------+----------+---------------+-------------------+---------+--------+-------------
 pg_default | postgres |               |                   |         | 25 MB  |
 pg_global  | postgres |               |                   |         | 568 kB |
 tbzabbix   | postgres | /pgsql/zabbix |                   |         | 60 MB  |
(3 rows)

postgres=# \du+
                                          List of roles
 Role name |                         Attributes                         | Member of | Description
-----------+------------------------------------------------------------+-----------+-------------
 postgres  | Superuser, Create role, Create DB, Replication, Bypass RLS | {}        |
 zabbix    |                                                            | {}        |
</file>

===== Atualizando o acesso do zabbix =====
<file bash>
$ vim /var/lib/pgsql/13/data/pg_hba.conf
[...]
# Acesso Zabbix
host    zabbix          zabbix          127.0.0.1/32            scram-sha-256
host    zabbix          zabbix          10.0.240.0/24           scram-sha-256
</file>

<file bash>
$ vim /var/lib/pgsql/13/data/postgresql.conf
[...]
listen_addresses = 'localhost,10.0.240.100'
[...]
</file>

<file bash>
$ /usr/pgsql-14/bin/pg_ctl -D /var/lib/pgsql/14/data stop
</file>

<file bash>
$ exit
$ sudo systemctl start postgresql-14
$ sudo systemctl enable postgresql-14
$ sudo systemctl disable postgresql-13
</file>

===== Upgrade do zabbix server =====
<file bash>
$ sudo systemctl stop zabbix-server
$ sudo systemctl stop zabbix-agent2
</file>

<file bash>
$ sudo rpm -Uvh https://repo.zabbix.com/zabbix/6.2/rhel/8/x86_64/zabbix-release-6.2-1.el8.noarch.rpm
Retrieving https://repo.zabbix.com/zabbix/6.2/rhel/8/x86_64/zabbix-release-6.2-1.el8.noarch.rpm
Verifying...                          ################################# [100%]
Preparing...                          ################################# [100%]
Updating / installing...
   1:zabbix-release-6.2-1.el8         ################################# [ 50%]
Cleaning up / removing...
   2:zabbix-release-6.0-2.el8         ################################# [100%]
</file>

<file bash>
$ sudo dnf clean all
</file>

<file bash>
$ sudo dnf upgrade zabbix-server-pgsql zabbix-agent2 zabbix-selinux-policy zabbix-sql-scripts
</file>

<file bash>
$ sudo systemctl start zabbix-server
$ sudo systemctl start zabbix-agent2
</file>

<file bash>
$ cat /var/log/zabbix/zabbix_server.log | grep database | tail -n 4
 10586:20220719:132353.438 completed 97% of database upgrade
 10586:20220719:132353.449 completed 98% of database upgrade
 10586:20220719:132353.458 completed 100% of database upgrade
 10586:20220719:132353.460 database upgrade fully completed
</file>

===== Upgrade zabbix web =====
<file bash>
$ sudo rpm -Uvh https://repo.zabbix.com/zabbix/6.2/rhel/8/x86_64/zabbix-release-6.2-1.el8.noarch.rpm
Retrieving https://repo.zabbix.com/zabbix/6.2/rhel/8/x86_64/zabbix-release-6.2-1.el8.noarch.rpm
Verifying...                          ################################# [100%]
Preparing...                          ################################# [100%]
Updating / installing...
   1:zabbix-release-6.2-1.el8         ################################# [ 50%]
Cleaning up / removing...
   2:zabbix-release-6.0-2.el8         ################################# [100%]
</file>

<file bash>
$ sudo dnf clean all
</file>

<file bash>
$ sudo dnf upgrade zabbix-web-pgsql zabbix-apache-conf zabbix-agent2 zabbix-selinux-policy
</file>

<file bash>
$ sudo systemctl restart httpd
</file>

===== Referências =====
  - [[https://dbsguru.com/postgresql-major-version-upgrade-from-12-8-to-13-4-pg_upgrade/|PostgreSQL major version upgrade from 12.8 to 13.4 using pg_upgrade]]
  - [[https://bestmonitoringtools.com/upgrade-zabbix-to-the-latest-version/|Upgrade Zabbix (5.0, 5.2, 5.4) to 6.0 like a Pro [+6.0 to 6.2 guide]]]