I am using Sphinx 2.2.11-id64-release and gem 'thinking-sphinx', '3.3.0'.
rake ts:configureworks fine and generated development development.sphinx.conf
But when running sphinx rake ts:index ts:start it fails and shows these errors in logs:
[Fri Dec 21 18:00:19.858 2018] [31823] WARNING: index 'section_not_today_1_with_text_89_idx_core': preload: failed to open /home/tyler/nmir/db/sphinx/development1/89/section_not_today_1_with_text_89_idx_core.spa: Too many open files; NOT SERVING
[Fri Dec 21 18:00:19.858 2018] [31823] WARNING: index 'section_today_0_with_text_address_89_idx_core': preload: failed to open /home/tyler/nmir/db/sphinx/development0/89/section_today_0_with_text_address_89_idx_core.spa: Too many open files; NOT SERVING
[Fri Dec 21 18:00:19.858 2018] [31823] WARNING: index 'section_not_today_0_with_text_address_89_idx_core': preload: failed to open /home/tyler/nmir/db/sphinx/development0/89/section_not_today_0_with_text_address_89_idx_core.spa: Too many open files; NOT SERVING
[Fri Dec 21 18:00:19.859 2018] [31823] WARNING: index 'section_today_1_with_text_address_89_idx_core': preload: failed to open /home/tyler/nmir/db/sphinx/development1/89/section_today_1_with_text_address_89_idx_core.spa: Too many open files; NOT SERVING
[Fri Dec 21 18:00:19.859 2018] [31823] WARNING: index 'section_not_today_1_with_text_address_89_idx_core': preload: failed to open /home/tyler/nmir/db/sphinx/development1/89/section_not_today_1_with_text_address_89_idx_core.spa: Too many open files; NOT SERVING
[Fri Dec 21 18:00:19.860 2018] [31823] WARNING: index 'section_today_0_with_text_90_idx_core': preload: failed to open /home/tyler/nmir/db/sphinx/development0/90/section_today_0_with_text_90_idx_core.spa: Too many open files; NOT SERVING
[Fri Dec 21 18:00:19.860 2018] [31823] WARNING: index 'section_not_today_0_with_text_90_idx_core': preload: failed to open /home/tyler/nmir/db/sphinx/development0/90/section_not_today_0_with_text_90_idx_core.spa: Too many open files; NOT SERVING
[Fri Dec 21 18:00:19.860 2018] [31823] WARNING: index 'section_today_1_with_text_90_idx_core': preload: failed to open /home/tyler/nmir/db/sphinx/development1/90/section_today_1_with_text_90_idx_core.spa: Too many open files; NOT SERVING
[Fri Dec 21 18:00:19.861 2018] [31823] WARNING: index 'section_not_today_1_with_text_90_idx_core': preload: failed to open /home/tyler/nmir/db/sphinx/development1/90/section_not_today_1_with_text_90_idx_core.spa: Too many open files; NOT SERVING
[Fri Dec 21 18:00:19.861 2018] [31823] WARNING: index 'section_today_0_with_text_address_90_idx_core': preload: failed to open /home/tyler/nmir/db/sphinx/development0/90/section_today_0_with_text_address_90_idx_core.spa: Too many open files; NOT SERVING
[Fri Dec 21 18:00:19.862 2018] [31823] WARNING: index 'section_not_today_0_with_text_address_90_idx_core': preload: failed to open /home/tyler/nmir/db/sphinx/development0/90/section_not_today_0_with_text_address_90_idx_core.spa: Too many open files; NOT SERVING
[Fri Dec 21 18:00:19.862 2018] [31823] WARNING: index 'section_today_1_with_text_address_90_idx_core': preload: failed to open /home/tyler/nmir/db/sphinx/development1/90/section_today_1_with_text_address_90_idx_core.spa: Too many open files; NOT SERVING
[Fri Dec 21 18:00:19.863 2018] [31823] WARNING: index 'section_not_today_1_with_text_address_90_idx_core': preload: failed to open /home/tyler/nmir/db/sphinx/development1/90/section_not_today_1_with_text_address_90_idx_core.spa: Too many open files; NOT SERVING
[Fri Dec 21 18:00:19.863 2018] [31823] WARNING: index 'section_today_0_with_text_91_idx_core': preload: failed to open /home/tyler/nmir/db/sphinx/development0/91/section_today_0_with_text_91_idx_core.spa: Too many open files; NOT SERVING
[Fri Dec 21 18:00:19.864 2018] [31823] WARNING: index 'section_not_today_0_with_text_91_idx_core': preload: failed to open /home/tyler/nmir/db/sphinx/development0/91/section_not_today_0_with_text_91_idx_core.spa: Too many open files; NOT SERVING
[Fri Dec 21 18:00:19.864 2018] [31823] WARNING: index 'section_today_1_with_text_91_idx_core': preload: failed to open /home/tyler/nmir/db/sphinx/development1/91/section_today_1_with_text_91_idx_core.spa: Too many open files; NOT SERVING
[Fri Dec 21 18:00:19.864 2018] [31823] WARNING: index 'section_not_today_1_with_text_91_idx_core': preload: failed to open /home/tyler/nmir/db/sphinx/development1/91/section_not_today_1_with_text_91_idx_core.spa: Too many open files; NOT SERVING
[Fri Dec 21 18:00:19.865 2018] [31823] WARNING: index 'section_today_0_with_text_address_91_idx_core': preload: failed to open /home/tyler/nmir/db/sphinx/development0/91/section_today_0_with_text_address_91_idx_core.spa: Too many open files; NOT SERVING
[Fri Dec 21 18:00:19.865 2018] [31823] WARNING: index 'section_not_today_0_with_text_address_91_idx_core': preload: failed to open /home/tyler/nmir/db/sphinx/development0/91/section_not_today_0_with_text_address_91_idx_core.spa: Too many open files; NOT SERVING
[Fri Dec 21 18:00:19.865 2018] [31823] WARNING: index 'section_today_1_with_text_address_91_idx_core': preload: failed to open /home/tyler/nmir/db/sphinx/development1/91/section_today_1_with_text_address_91_idx_core.spa: Too many open files; NOT SERVING
[Fri Dec 21 18:00:19.866 2018] [31823] WARNING: index 'section_not_today_1_with_text_address_91_idx_core': preload: failed to open /home/tyler/nmir/db/sphinx/development1/91/section_not_today_1_with_text_address_91_idx_core.spa: Too many open files; NOT SERVING
[Fri Dec 21 18:00:19.868 2018] [31823] FATAL: failed to create /home/tyler/nmir/tmp/binlog/development/binlog.001: errno=24, error=Too many open files
[Fri Dec 21 18:00:19.915 2018] [31822] watchdog: main process 31823 exited cleanly (exit code 1), shutting down
Solved this issue by adding the following line to both /etc/systemd/system.conf and /etc/systemd/user.conf
DefaultLimitNOFILE=65000