Hi,

I am getting the following error when I try to use balancer_by_lua with ngx.balancer in my NGINX configuration.

2017/10/26 08:13:38 [error] 22447#22447: *10 failed to run balancer_by_lua*: balancer_by_lua:2: module 'ngx.balancer' not found:
no field package.preload['ngx.balancer']
no file '/home/rajesh/lua-resty-http-master/lib/ngx/balancer.lua'
no file '/home/rajesh/lua-resty-balancer-master/lib/ngx/balancer.lua'
no file './ngx/balancer.lua'
no file '/usr/local/share/luajit-2.0.5/ngx/balancer.lua'
no file '/usr/local/share/lua/5.1/ngx/balancer.lua'
no file '/usr/local/share/lua/5.1/ngx/balancer/init.lua'
no file '/home/rajesh/lua-resty-balancer-master/ngx/balancer.so'
no file './ngx/balancer.so'
no file '/usr/local/lib/lua/5.1/ngx/balancer.so'
no file '/usr/local/lib/lua/5.1/loadall.so'
no file '/home/rajesh/lua-resty-balancer-master/ngx.so'
no file './ngx.so'
no file '/usr/local/lib/lua/5.1/ngx.so'
no file '/usr/local/lib/lua/5.1/loadall.so'
stack traceback:
[C]: in function 'require'
balancer_by_lua:2: in function <balancer_by_lua:1> while connecting to upstream, client: 192.168.1.3, server: myserver.com, request: "GET /images/6314.jpeg HTTP/1.1"


The upstream config snippet is as follows:
upstream backends {
server 0.0.0.1;
balancer_by_lua_block {
local b = require "ngx.balancer"
.....


[root@localhost rajesh]# /usr/sbin/nginx -V
nginx version: nginx/1.12.1
built by gcc 4.8.5 20150623 (Red Hat 4.8.5-11) (GCC)
built with OpenSSL 1.0.2l 25 May 2017
TLS SNI support enabled
configure arguments: --prefix=/etc/nginx --with-openssl-opt=-fPIC --with-openssl=/home/rajesh/nginx_prod_build_test/openssl-1.0.2l --sbin-path=/usr/sbin/nginx --modules-path=/usr/lib64/nginx/modules --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx.pid --lock-path=/var/run/lock/subsys/nginx --user=nginx --group=nginx --with-http_ssl_module --with-http_realip_module --with-http_addition_module --with-http_sub_module --with-http_dav_module --with-http_flv_module --with-http_mp4_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_random_index_module --with-http_secure_link_module --with-http_degradation_module --with-http_slice_module --with-http_stub_status_module --with-http_xslt_module=dynamic --with-http_image_filter_module=dynamic --with-http_geoip_module=dynamic --with-http_perl_module=dynamic --with-threads --with-stream=dynamic --with-stream_ssl_module --with-http_auth_request_module --with-mail=dynamic --with-mail_ssl_module --with-file-aio --with-pcre --with-pcre-jit --with-google_perftools_module --with-http_v2_module --add-module=/home/rajesh/nginx_prod_build_test/headers-more-nginx-module-0.32 --with-cc-opt='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic -O2 -fPIC -g -pipe -Wno-error -fstack-protector -std=c++11 -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m64 -mtune=generic' --with-ld-opt='-Wl,-z,relro -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -Wl,-E -Wl,-rpath,/usr/local/lib' --with-debug --add-module=/home/rajesh/nginx-upstream-carp-master --add-module=/home/rajesh/ngx_devel_kit-0.3.0 --add-module=/home/rajesh/lua-nginx-module-0.10.11rc2

Any inputs regarding the reason for this error, and how to resolve this?

Thanks
Rajesh