How to create a docker image with minimal JDK 11? There is no jre11_headless

Help
1

I’m looking for a way to build Java 11 with minimal dependencies. More specifically, I’m building a docker image to run jenkins on.
jre8_headless package is the smallest, and binary cache from official server is available. I’m just curious if there is a way to build smaller image with JDK 11.
I’ve tried adoptopenjdk-jre-bin, but looks much bigger than jre8_headless.

Is there any way to make the image built with nix smaller? It probably has java compiler stripped already. Can I also remove GUI related staff as well?

2

You can use the module system to build a jre_minimal with just the modules you need as documented here. I’m not sure that will end up being smaller than jre8_headless, though, that would be something to check…

1 Like
3

jre_minimal is built from OpenJDK 15, not 11, and is much bigger than jre8_headless.
Docker image size of each package (without including other dependencies and last layer) is

jre8_headless: 144.7MB
jre_minimal: 884.2MB

jre_minimal’s default modules is already minimal (it only contains java.base), so I guess other things are taking up disk space.

4

There is headless version of jdk11 (jdk11_headless) and is slightly smaller: 589.5MB.
adoptopenjdk-jre-bin is much smaller, but still 3x as big as jre8_headless: 459.3MB

5

Looks like adoptopenjdk-jre-bin only contains JRE, but contains GUI related staffs (non-headless), which is pointless for server side use.

Creating layer 0 from paths: ['/nix/store/a8sjzh4lyd9fakbsvbi7gmpnfyasj7hy-libunistring-0.9.10', '/nix/store/am4r5prrmr0ydz3ksrn31wra293vsnz4-libidn2-2.3.0', '/nix/store/hp8wcylqr14hrrpqap4wdrwzq092wfln-glibc-2.32-37', '/nix/store/1srmyg1a8cxqwd0hd24rj6kw4lqd61yq-zlib-1.2.11', '/nix/store/icxlx0myvh5ajd1mlaqnlzsqvqx348pg-libXau-1.0.9', '/nix/store/nwcsjyv4rf4d6bkqjcg5c7nr2vh93dz1-libXdmcp-1.1.3', '/nix/store/z5l2fm9byiz5yr82iznkv2rynr85ajnv-gcc-10.2.0-lib', '/nix/store/f7jzmxq9bpbxsg69cszx56mw14n115n5-bash-4.4-p23', '/nix/store/bkzbjjkfipj6hr1m36yxpxbw16s238wi-libxcb-1.14', '/nix/store/aq0wqny5gw6jaf4sr24fp7baf097pfla-libX11-1.7.0', '/nix/store/a1rqznw74f3la8g3hwk31v9x0skl07wr-attr-2.4.48', '/nix/store/6hcqnys5sii21xi821f8yg7mvj7cx5dl-util-linux-2.36.1', '/nix/store/0cybwb4bqil654x46nnbhfg26lni4h5c-bzip2-1.0.6.0.1', '/nix/store/y5faxai8f5kgnbyjbwkfvq86ic1awf63-db-4.8.30', '/nix/store/4clrialdn6i2w6gdsrbpy76qvgdq20vl-pcre-8.44', '/nix/store/b7ms1xiy6m51xkw6qk1z0qwhxgnwplkv-libffi-3.3', '/nix/store/42rhxib7kw797wq8a715qyzfqakz8g36-acl-2.2.53', '/nix/store/p7gxzcp2jg84q6mr1pgynkql88mzpzaq-linux-pam-1.5.1', '/nix/store/68fzwlgvpg00zq8w4n6dg8bmcwyh91ls-libpng-apng-1.6.37', '/nix/store/mz87xcyjjv0sl6h9bs9d39m85d4qb00n-gmp-6.2.1', '/nix/store/wm8aiqpj09xlw1h7cqgsiv0m96qn1mww-libselinux-3.0', '/nix/store/bb59zsb4imiq6z6n203ic0plk7y5jiw2-ncurses-6.2', '/nix/store/w21pgi6691202iafl0cnr7hk6wvvdz3n-coreutils-8.32', '/nix/store/mbxi7rhg9pj2mfnzr7dk9cd46xdhnrf9-glibc-2.32-37-bin', '/nix/store/4ly3l4g312adn82dha8ic2x1hs4zvq2g-libgpg-error-1.41', '/nix/store/8nxvl94y69nsi0bc5glzakpmd1v755k2-xz-5.2.5', '/nix/store/bqgh27q7fhkavvn7jf7gmyy084n5xgy2-glib-2.66.4', '/nix/store/qgb0q5rqgpxr5kc7vl2vfhcwg5210dbn-libXext-1.3.4', '/nix/store/k514dbajcp0wb32rnglvc940gldj549h-bzip2-1.0.6.0.1-bin', '/nix/store/bnpadh78k2qf3hshwapl5s51dj87yykp-gzip-1.10', '/nix/store/8skdlv4is5dx7k4qv85dky8xqlw56vv0-libtasn1-4.16.0', '/nix/store/0q22n71lh82nv9vr8lzdwm81mwqipaan-nettle-3.6', '/nix/store/f7jpwsi3yiy98pjv6m06m5j2hxds84cm-openssl-1.1.1j', '/nix/store/l8spvm6y3fs8sxingmcphy5nrrv0w8jy-readline-7.0p5', '/nix/store/ilmrf7li6qg85q3h45472wp8337dwi28-shadow-4.8.1', '/nix/store/irqh1z8ldk08v87prqpsbc8vrznsqq6a-dejavu-fonts-minimal-2.37', '/nix/store/6c6ifrz2dlbahzg7cjlilb6aj76725vy-libevent-2.1.12', '/nix/store/lb8dmjgz65cc737bhraq258zhfmm3p7m-libmnl-1.0.4', '/nix/store/fw7djzcdfnwggfg9d4lq016vbb521z93-freetype-2.10.4', '/nix/store/zi0h48f1jb88k4xrszg212qld7i3rxcz-audit-2.8.5', '/nix/store/8wbyyhschvbg0r3p6lh6vpvys6zk4ivc-bash-interactive-4.4-p23', '/nix/store/l5gn6w5zlrs3iyp5yyrp5ddz6hc97x2y-kbd-2.0.4', '/nix/store/lbw8y6y77a6f76rdx7znc9irv5xch5lk-kexec-tools-2.0.20', '/nix/store/bn6zidj988hc2pvp6k08slj5fk7qfcc9-kmod-27', '/nix/store/7qmny92wsmcp85f06cgw0ia0sf917vkn-libcap-2.47-lib', '/nix/store/n9y6nsg0llg8bdrw37cb54x71jbg98m1-libseccomp-2.5.1-lib', '/nix/store/mby5cajr19n4akyga9pbjrcimmmr3z9s-util-linux-2.36.1-bin', '/nix/store/rk30zwdai5ch2as0yqk36jliinxabb1v-expat-2.2.10', '/nix/store/yv7kq8ifyxb9bhpir3ldl79xyp9khjll-dns-root-data-2019-01-11', '/nix/store/s7ll52xkkl4a2lvx6s9siyvcc2smb5di-libnfnetlink-1.0.1', '/nix/store/c1ss4vfipvqp6k2iywsb3zlgcbm7x2r4-p11-kit-0.23.22', '/nix/store/85820n8bc1ygmr93y6rlxhdnpcnx7y5y-unbound-1.13.0-lib', '/nix/store/6qqgmghykh5z6zz2apj0j94rrk3xwwdj-keyutils-1.6.3-lib', '/nix/store/aagq5fchdf079m8i50rgqa6vyq3xaksa-libgcrypt-1.9.1', '/nix/store/vbyifyycrq5rl8jij32zpw4fryqlwhyn-systemd-minimal-247.3', '/nix/store/f3mp6vclqfk78r15rqwnf6jl044zgk13-fontconfig-2.13.92', '/nix/store/1w61bxm2jywck4z598ymrd1676xwh6qj-gnutls-3.6.15', '/nix/store/33rnhiia9as23s5qr622xrkgrljn0i80-json-c-0.15', '/nix/store/vbvcil9didsqpgcmwm07lnmd2dk3x4ll-libICE-1.0.10', '/nix/store/bxp0nq2vmvv1ixihx13jym17pkmq80g2-libassuan-2.5.4', '/nix/store/gi12qahl7d6h26sgj04mm89gimkanf6q-libkrb5-1.18', '/nix/store/lshycmlfx70x83pi059q7csv9l5r30wd-libnetfilter_conntrack-1.0.8', '/nix/store/51fkh7bxlp1120skmrrznx4sq00fwpdy-libnftnl-1.1.9', '/nix/store/83ic7dnwgmm4dim4zylrr1ghsfydhgdm-libpcap-1.10.0', '/nix/store/52nff18kzg5h4nrbbznh7jwchnaw475a-libssh2-1.9.0', '/nix/store/yz46zif5vbbk4zvi3w59vp5jvl7sflfw-lvm2-2.03.11-lib', '/nix/store/wa8kywmn2aywkrj8n7kir4j90x64cjib-nghttp2-1.41.0-lib', '/nix/store/grmaq7mvpn8br7nmmcl23vsvfh0dp0ic-popt-1.16', '/nix/store/abcxd9c3idz2frmaz5n31g13ha7mxrmx-libXrender-0.9.10', '/nix/store/b9r234wnx3a6snzb3gma244y0b7dmm4b-cryptsetup-2.3.4', '/nix/store/8aiy8lz2hj3m514adimkly50bvhj4bbx-curl-7.74.0', '/nix/store/ym1d4kx870cpmcj8spf1y9kjdydz25fd-gnupg-2.2.27', '/nix/store/39qygzkhcb9i684w3fhr2kkz5gmcyycd-gnutar-1.32', '/nix/store/h606si3hh9myvq2wk753wgn7wkhhxkq4-iptables-1.8.7', '/nix/store/bfjrh208n4dn8vbyacyfybkzkrv3234y-libapparmor-2.13.6', '/nix/store/n7908vdjz8s3dsnahamg7w9cakxlv9sj-libmicrohttpd-0.9.71', '/nix/store/0b3bisslwm6hd5pgllbmq6x7z6k4ifwz-lz4-1.9.3', '/nix/store/h905c1j6sp6kks9fac1z6c8872rlrqz0-pcre2-10.36', '/nix/store/svry86r4mzky8rjh0l94idf9ckgn8cx5-fontconfig-2.13.92-lib', '/nix/store/jf7dcwcmgzwsk8zzdl503mgg5jbqykg4-libSM-1.2.3', '/nix/store/d4z7srqafd4krf10dsg3kqn1fa9hmk25-libglvnd-1.3.2', '/nix/store/4712fsjq670jsqjrpkkmpfzhi9g1k4nj-systemd-247.3', '/nix/store/8ksz4gml5094f8xmvzdrhdnpz977m4ng-pixman-0.38.4', '/nix/store/ac217pfpzgqpw2hs4gpnqqwsw3l2172c-dbus-1.12.20-lib', '/nix/store/q092s6ck0kijzaxrz907xhla6irs4hls-libXi-1.7.10', '/nix/store/x1b2xssir8y0282i7qmfqdl3vy717sl1-libxml2-2.9.10', '/nix/store/pcqjic85gc9vs4k9vrl8sqskmz4av2pr-cairo-1.16.0', '/nix/store/8wijj3pr443ng0fa6xjcdas7b51n54kf-libdaemon-0.14', '/nix/store/1szpdjmqv5rszh09nsghi8pi454v5983-dconf-0.38.0-lib', '/nix/store/v65zx8a7snnm14ghmmhqswyxl9ybnyzr-graphite2-1.3.14', '/nix/store/w6mxxrldbywyqbzpqv78zh3lp3fbn4v1-libXfixes-5.0.3', '/nix/store/9bq7kznvpvhxsdsr0isj8svn9glxzlh5-avahi-0.8', '/nix/store/bpa6dv7ssy3wqmmkb0j1q6vh5i40qzni-libXtst-1.2.3', '/nix/store/6nzyfx921hg2j4i45xv6rklw5f18vvgd-libjpeg-turbo-2.0.6', '/nix/store/szphjhh0j68yhddyw2zh8ykr00mhd1r2-publicsuffix-list-2019-05-24', '/nix/store/6smnc44sby6l4k517fchrz6zyzpgfikz-sqlite-3.34.1', '/nix/store/1y7vdq6pdj73aqf63jh9ixblas8inklw-atk-2.36.0', '/nix/store/4rrg422zn0g47lmnixy0q5yg57d81wbl-brotli-1.0.9-lib', '/nix/store/ddygv6p4b2i6iglm47ss9sinqj7swff2-fribidi-1.0.10', '/nix/store/3p90scbz7sbf7fdwggl0w4k8wwr0nkkl-gsettings-desktop-schemas-3.38.0', '/nix/store/jj9q6laz6f3k2znqbssdyilp6zlqw0ry-harfbuzz-2.7.4', '/nix/store/26j95559973ymp25z5x7jy8mbwjmjpqr-libdatrie-2019-12-20-lib', '/nix/store/523wns3xbkxcrngng2cx55jx5d2asjr5-libpsl-0.21.0', '/nix/store/0k85m9cz4jl5wrz0b4fhkpck8bicwqh7-at-spi2-core-2.38.0', '/nix/store/zf12b9za1v3yk3q25lfkbp31ba9gvm6s-cups-2.3.3-lib', '/nix/store/gj21rjnsa4b4xbamwg5p88sy92dkx6cf-gobject-introspection-1.66.1', '/nix/store/hs1zphws1iyddrvfyqs7qj9qw6qqs0mc-icu4c-68.2', '/nix/store/2j87kyrlk7xyxpk1v6kwzgkbfndgsvm3-json-glib-1.6.2', '/nix/store/57wzvxk457izfpg1ir6xp3pkgidq5y02-libGL-1.3.2', '/nix/store/xsz4wvc3j15nbj4f5l6bw0gdgxcrliqm-libXft-2.3.3', '/nix/store/f1zzq6n4ahrzynprj07pgpiyycn8r606-libsoup-2.72.0', '/nix/store/nqxgzzy2qq1v7jyihvasc026nf9myr5j-libthai-0.1.28', '/nix/store/dnjbcvnv6q10qxphqiqkpfn13azs4972-libtiff-4.1.0', '/nix/store/af5dcwcw07bx163ifzb8b7ifkay69snc-xkeyboard-config-2.31', '/nix/store/nx07ciwhd9jpgi8srl71g96rgan4n048-alsa-topology-conf-1.2.4', '/nix/store/x9wczmzn6ncalnf6w93s9smzq945bz9l-alsa-ucm-conf-1.2.4', '/nix/store/afyhdvq0lyy21vn4z8921365lhx3rfvc-at-spi2-atk-2.38.0', '/nix/store/vphjq698sk3x90bwxigaazvmdyr8sjcp-epoxy-1.5.4', '/nix/store/2hms6sdg0b05y4ag361yxhfm9cpiapk4-gdk-pixbuf-2.42.2', '/nix/store/knrm9d5gg99cvznyk4mw34q38ad949p0-iso-codes-4.5.0', '/nix/store/bn0j1jdnx3pcf7pkqdhclv5wvywdnqib-libXcomposite-0.4.5', '/nix/store/z5zhkvxd2bsm3qj7j4921gzsch9spywr-libXcursor-1.2.0', '/nix/store/irwa02crsg91brj13m5qfhxkfqkkxnjb-libXdamage-1.1.5', '/nix/store/2jdn1hph0w84m3gqha84navmlkias8x4-libXinerama-1.1.4', '/nix/store/d6a61as9fhb8fq074cskbhbw9ampchr0-libXrandr-1.5.2', '/nix/store/h0vwxjvxf9zq66jarw35iyhnhy0c3cls-libxkbcommon-1.0.3', '/nix/store/54j1pgrcxb9qb2xlqn1dlswqrixjbll0-pango-1.47.0', '/nix/store/p984smsbqql875dsd26ffpdv2iyhvn27-tracker-3.0.1', '/nix/store/0484z63gw2nwkzcf0gvgr432xlpbigwi-wayland-1.19.0', '/nix/store/xn51dcfnjjy402b9pv89ndgnrnxf3pkb-alsa-lib-1.2.4', '/nix/store/nb9dx0v21kmp6xhhjqwsdd1gw11my7pq-gtk+3-3.24.24', '/nix/store/4lyhqv1k8qgwk7bqkpi3bb7931w687w5-adoptopenjdk-jre-hotspot-bin-11.0.9']

On the other hand, jdk11_headless does not contain GUI related staffs, but contains java compilers.

['/nix/store/a8sjzh4lyd9fakbsvbi7gmpnfyasj7hy-libunistring-0.9.10', '/nix/store/am4r5prrmr0ydz3ksrn31wra293vsnz4-libidn2-2.3.0', '/nix/store/hp8wcylqr14hrrpqap4wdrwzq092wfln-glibc-2.32-37', '/nix/store/z5l2fm9byiz5yr82iznkv2rynr85ajnv-gcc-10.2.0-lib', '/nix/store/fcsckirajf7gk81rfjm7w408l7y4b6zi-hook', '/nix/store/a8v7bhvbhx8z0v82hnnb9chclcqvqgaj-lcms2-2.12', '/nix/store/6nzyfx921hg2j4i45xv6rklw5f18vvgd-libjpeg-turbo-2.0.6', '/nix/store/1srmyg1a8cxqwd0hd24rj6kw4lqd61yq-zlib-1.2.11', '/nix/store/g3wrldf77pnbd8j037x90a9wz48f6shz-openjdk-headless-11.0.10+9']

jre_minimal seem to contain lot more staff.

Creating layer 0 from paths: ['/nix/store/a8sjzh4lyd9fakbsvbi7gmpnfyasj7hy-libunistring-0.9.10', '/nix/store/am4r5prrmr0ydz3ksrn31wra293vsnz4-libidn2-2.3.0', '/nix/store/hp8wcylqr14hrrpqap4wdrwzq092wfln-glibc-2.32-37', '/nix/store/f7jzmxq9bpbxsg69cszx56mw14n115n5-bash-4.4-p23', '/nix/store/z5l2fm9byiz5yr82iznkv2rynr85ajnv-gcc-10.2.0-lib', '/nix/store/1srmyg1a8cxqwd0hd24rj6kw4lqd61yq-zlib-1.2.11', '/nix/store/a1rqznw74f3la8g3hwk31v9x0skl07wr-attr-2.4.48', '/nix/store/y5faxai8f5kgnbyjbwkfvq86ic1awf63-db-4.8.30', '/nix/store/6hcqnys5sii21xi821f8yg7mvj7cx5dl-util-linux-2.36.1', '/nix/store/p7gxzcp2jg84q6mr1pgynkql88mzpzaq-linux-pam-1.5.1', '/nix/store/42rhxib7kw797wq8a715qyzfqakz8g36-acl-2.2.53', '/nix/store/icxlx0myvh5ajd1mlaqnlzsqvqx348pg-libXau-1.0.9', '/nix/store/nwcsjyv4rf4d6bkqjcg5c7nr2vh93dz1-libXdmcp-1.1.3', '/nix/store/0cybwb4bqil654x46nnbhfg26lni4h5c-bzip2-1.0.6.0.1', '/nix/store/bkzbjjkfipj6hr1m36yxpxbw16s238wi-libxcb-1.14', '/nix/store/bb59zsb4imiq6z6n203ic0plk7y5jiw2-ncurses-6.2', '/nix/store/b7ms1xiy6m51xkw6qk1z0qwhxgnwplkv-libffi-3.3', '/nix/store/4clrialdn6i2w6gdsrbpy76qvgdq20vl-pcre-8.44', '/nix/store/mz87xcyjjv0sl6h9bs9d39m85d4qb00n-gmp-6.2.1', '/nix/store/mbxi7rhg9pj2mfnzr7dk9cd46xdhnrf9-glibc-2.32-37-bin', '/nix/store/w21pgi6691202iafl0cnr7hk6wvvdz3n-coreutils-8.32', '/nix/store/4ly3l4g312adn82dha8ic2x1hs4zvq2g-libgpg-error-1.41', '/nix/store/8nxvl94y69nsi0bc5glzakpmd1v755k2-xz-5.2.5', '/nix/store/f7jpwsi3yiy98pjv6m06m5j2hxds84cm-openssl-1.1.1j', '/nix/store/aq0wqny5gw6jaf4sr24fp7baf097pfla-libX11-1.7.0', '/nix/store/k514dbajcp0wb32rnglvc940gldj549h-bzip2-1.0.6.0.1-bin', '/nix/store/bnpadh78k2qf3hshwapl5s51dj87yykp-gzip-1.10', '/nix/store/l8spvm6y3fs8sxingmcphy5nrrv0w8jy-readline-7.0p5', '/nix/store/ilmrf7li6qg85q3h45472wp8337dwi28-shadow-4.8.1', '/nix/store/lb8dmjgz65cc737bhraq258zhfmm3p7m-libmnl-1.0.4', '/nix/store/8skdlv4is5dx7k4qv85dky8xqlw56vv0-libtasn1-4.16.0', '/nix/store/0q22n71lh82nv9vr8lzdwm81mwqipaan-nettle-3.6', '/nix/store/wm8aiqpj09xlw1h7cqgsiv0m96qn1mww-libselinux-3.0', '/nix/store/zi0h48f1jb88k4xrszg212qld7i3rxcz-audit-2.8.5', '/nix/store/8wbyyhschvbg0r3p6lh6vpvys6zk4ivc-bash-interactive-4.4-p23', '/nix/store/l5gn6w5zlrs3iyp5yyrp5ddz6hc97x2y-kbd-2.0.4', '/nix/store/lbw8y6y77a6f76rdx7znc9irv5xch5lk-kexec-tools-2.0.20', '/nix/store/bn6zidj988hc2pvp6k08slj5fk7qfcc9-kmod-27', '/nix/store/7qmny92wsmcp85f06cgw0ia0sf917vkn-libcap-2.47-lib', '/nix/store/n9y6nsg0llg8bdrw37cb54x71jbg98m1-libseccomp-2.5.1-lib', '/nix/store/mby5cajr19n4akyga9pbjrcimmmr3z9s-util-linux-2.36.1-bin', '/nix/store/6c6ifrz2dlbahzg7cjlilb6aj76725vy-libevent-2.1.12', '/nix/store/s7ll52xkkl4a2lvx6s9siyvcc2smb5di-libnfnetlink-1.0.1', '/nix/store/yv7kq8ifyxb9bhpir3ldl79xyp9khjll-dns-root-data-2019-01-11', '/nix/store/c1ss4vfipvqp6k2iywsb3zlgcbm7x2r4-p11-kit-0.23.22', '/nix/store/85820n8bc1ygmr93y6rlxhdnpcnx7y5y-unbound-1.13.0-lib', '/nix/store/6qqgmghykh5z6zz2apj0j94rrk3xwwdj-keyutils-1.6.3-lib', '/nix/store/aagq5fchdf079m8i50rgqa6vyq3xaksa-libgcrypt-1.9.1', '/nix/store/vbyifyycrq5rl8jij32zpw4fryqlwhyn-systemd-minimal-247.3', '/nix/store/bqgh27q7fhkavvn7jf7gmyy084n5xgy2-glib-2.66.4', '/nix/store/1w61bxm2jywck4z598ymrd1676xwh6qj-gnutls-3.6.15', '/nix/store/33rnhiia9as23s5qr622xrkgrljn0i80-json-c-0.15', '/nix/store/bxp0nq2vmvv1ixihx13jym17pkmq80g2-libassuan-2.5.4', '/nix/store/gi12qahl7d6h26sgj04mm89gimkanf6q-libkrb5-1.18', '/nix/store/lshycmlfx70x83pi059q7csv9l5r30wd-libnetfilter_conntrack-1.0.8', '/nix/store/51fkh7bxlp1120skmrrznx4sq00fwpdy-libnftnl-1.1.9', '/nix/store/83ic7dnwgmm4dim4zylrr1ghsfydhgdm-libpcap-1.10.0', '/nix/store/52nff18kzg5h4nrbbznh7jwchnaw475a-libssh2-1.9.0', '/nix/store/yz46zif5vbbk4zvi3w59vp5jvl7sflfw-lvm2-2.03.11-lib', '/nix/store/wa8kywmn2aywkrj8n7kir4j90x64cjib-nghttp2-1.41.0-lib', '/nix/store/grmaq7mvpn8br7nmmcl23vsvfh0dp0ic-popt-1.16', 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'/nix/store/fw7djzcdfnwggfg9d4lq016vbb521z93-freetype-2.10.4', '/nix/store/ac217pfpzgqpw2hs4gpnqqwsw3l2172c-dbus-1.12.20-lib', '/nix/store/f3mp6vclqfk78r15rqwnf6jl044zgk13-fontconfig-2.13.92', '/nix/store/abcxd9c3idz2frmaz5n31g13ha7mxrmx-libXrender-0.9.10', '/nix/store/svry86r4mzky8rjh0l94idf9ckgn8cx5-fontconfig-2.13.92-lib', '/nix/store/x1b2xssir8y0282i7qmfqdl3vy717sl1-libxml2-2.9.10', '/nix/store/d4z7srqafd4krf10dsg3kqn1fa9hmk25-libglvnd-1.3.2', '/nix/store/1amg8fs88bj0ac06hbs1fbqf22c9rak5-readline-6.3p08', '/nix/store/6smnc44sby6l4k517fchrz6zyzpgfikz-sqlite-3.34.1', '/nix/store/8wijj3pr443ng0fa6xjcdas7b51n54kf-libdaemon-0.14', '/nix/store/8ksz4gml5094f8xmvzdrhdnpz977m4ng-pixman-0.38.4', '/nix/store/9azf582s9336m2k7rjg5xyd93qdfx8b8-icu4c-67.1', '/nix/store/i3p2pykb7pn6m1dpk6ryc0gpqlpbca6h-nspr-4.29', '/nix/store/9bq7kznvpvhxsdsr0isj8svn9glxzlh5-avahi-0.8', '/nix/store/pcqjic85gc9vs4k9vrl8sqskmz4av2pr-cairo-1.16.0', '/nix/store/cdz5vbnfp9vq84ir414cgnvzq63wp9m6-gdbm-1.19', 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6

Is there a way to strip unnecessary files from jre_minimal and gnome related staffs to make JDK package much smaller?

I’m probably doing something wrong because the docker image apparently contains development packages…

let
  sources = import ./sources.nix;
  pkgs = import sources.nixpkgs { };
in
pkgs.dockerTools.streamLayeredImage {
  name = "my-app/inbound-agent";
  contents = with pkgs; [
    jre_minimal
  ];
}

The document you linked does not provide full example. Do I need to compile Java program from source (in my case jenkins agent), to be able to strip unnecessary dependencies? I tried to use pre-compiled jar file.

Not sure how jdk version and headless option can be overriden.

7

I think I’ve figured it out… I just needed to create a new derivation using that JRE. Using jre directly will cause nix to include its dev dependencies.

let
  sources = import ./sources.nix;
  pkgs = import sources.nixpkgs { };
  jre = pkgs.jre_minimal.override {
    modules = ["java.base"];
    jdk = pkgs.jdk11_headless;
  };
  jenkinsAgent = pkgs.callPackage ./jenkins-agent.nix {
    inherit jre;
  };
in
pkgs.dockerTools.streamLayeredImage {
  name = "my-app/inbound-agent";
  contents = with pkgs; [
    # other dependencies...
  ] ++ [
    jenkinsAgent
  ];
  # other configs...
}

{ stdenv }:
stdenv.mkDerivation {
  # other configs...
  installPhase = ''
    # other scripts...
    wrapProgram "$out/bin/jenkins-agent" \
      --set JAVA_HOME "${jre.home}"
  '';
}

The size of first layer of the image is now 314.7MB. Still bigger than JRE8, but lot better than adoptopenjdk-jre-bin. Thank you!

Creating layer 0 from paths: ['/nix/store/a8sjzh4lyd9fakbsvbi7gmpnfyasj7hy-libunistring-0.9.10', '/nix/store/am4r5prrmr0ydz3ksrn31wra293vsnz4-libidn2-2.3.0', '/nix/store/hp8wcylqr14hrrpqap4wdrwzq092wfln-glibc-2.32-37', '/nix/store/z5l2fm9byiz5yr82iznkv2rynr85ajnv-gcc-10.2.0-lib', '/nix/store/1srmyg1a8cxqwd0hd24rj6kw4lqd61yq-zlib-1.2.11', '/nix/store/f7jzmxq9bpbxsg69cszx56mw14n115n5-bash-4.4-p23', '/nix/store/9f7pllxfaswk2zpd4wqmjx5rqvxvkmwq-nss-cacert-3.60', '/nix/store/ppws3jvbsqrska9y82vp34c5jxf5c86l-openjdk-headless-11.0.10+9-jre',
8

I’ve found later that lib/server/libjvm.so is very big (232.6 MB).
After running strip -p --strip-unneeded ./lib/server/libjvm.so the size went down to 17.5 MB.
Maybe a bug, I’ll report this as a GitHub issue.

https://github.com/docker-library/openjdk/issues/217

1 Like
9

That’s a great observation! Do you think we should add this step (perhaps optional but enabled by default) in the jre_minimal derivation or further ‘upstream’?

1 Like
10

I think that’s a good idea. Could you implement the feature in the derivation? I’m still a nix newbie and don’t know how to implement the feature properly.

Anyway I created the issue.

https://github.com/NixOS/nixpkgs/issues/115486

3 Likes