feat(library): Introduce Loki 2.9 as library

library/loki/2.9/.dockerignore

@@ -0,0 +1,6 @@
+.git
+.gitignore
+/Makefile.uk
+/.unikraft/
+/.config*
+README.md

library/loki/2.9/.gitignore

@@ -0,0 +1,3 @@
+/Makefile.uk
+/.unikraft/
+/.config*

library/loki/2.9/Dockerfile

@@ -0,0 +1,55 @@
+FROM golang:1.22-alpine AS loki-build
+
+WORKDIR /loki
+
+# Dependencies
+RUN set -xe; \
+    apk --no-cache add \
+      gcc \
+      make \
+      musl-dev \
+      wget \
+      git \
+      linux-headers \
+      upx \
+      binutils \
+    ; \
+    update-ca-certificates;
+
+# Build Loki as static PIE
+RUN set -xe; \
+    git clone https://github.com/grafana/loki.git .; \
+    git checkout v2.9.8; \
+    CGO_ENABLED=1 \
+    go build -v \
+      -buildmode=pie \
+      -ldflags "-linkmode external -extldflags '-static-pie' -s -w" \
+      -tags 'osusergo netgo static_build' \
+      -trimpath \
+      -o /usr/local/bin/loki \
+      ./cmd/loki; \
+    strip /usr/local/bin/loki; \
+    upx --best --lzma /usr/local/bin/loki
+
+FROM alpine:3 AS sys
+
+RUN set -xe; \
+    mkdir -p /target/etc; \
+    mkdir -p /target/tmp/loki/chunks; \
+    mkdir -p /target/tmp/loki/rules; \
+    mkdir -p /target/etc/loki; \
+    mkdir -p /blank; \
+    apk --no-cache add \
+      ca-certificates \
+    ; \
+    update-ca-certificates;
+
+FROM scratch
+
+COPY --from=sys /target/etc /etc
+COPY --from=sys /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
+COPY --from=sys /blank /tmp
+COPY --from=sys /target/tmp /tmp
+
+COPY --from=loki-build /usr/local/bin/loki /usr/local/bin/loki
+COPY loki-local-config.yaml /etc/loki/loki-local-config.yaml

library/loki/2.9/Kraftfile

@@ -0,0 +1,134 @@
+spec: v0.6
+
+name: loki
+
+rootfs: ./Dockerfile
+
+cmd: ["/usr/local/bin/loki", "-config.file=/etc/loki/loki-local-config.yaml"]
+
+template:
+  source: https://github.com/unikraft/app-elfloader.git
+  version: staging
+
+unikraft:
+  source: https://github.com/unikraft/unikraft.git
+  version: staging
+  kconfig:
+    # Configurations options for app-elfloader
+    # (they can't be part of the template atm)
+    CONFIG_LIBPOSIX_PROCESS_ARCH_PRCTL: 'y'
+    CONFIG_APPELFLOADER_BRK: 'y'
+    CONFIG_APPELFLOADER_CUSTOMAPPNAME: 'y'
+    CONFIG_APPELFLOADER_STACK_NBPAGES: 128
+    CONFIG_APPELFLOADER_VFSEXEC_EXECBIT: 'n'
+    CONFIG_APPELFLOADER_ENFORCE_PIE: 'n'
+    CONFIG_APPELFLOADER_VFSEXEC: 'y'
+    CONFIG_APPELFLOADER_AUTOGEN_REPLACEEXIST: 'y'
+    # Unikraft options
+    CONFIG_HAVE_PAGING_DIRECTMAP: 'y'
+    CONFIG_HAVE_PAGING: 'y'
+    CONFIG_I8042: 'y'
+    CONFIG_LIBDEVFS_AUTOMOUNT: 'y'
+    CONFIG_LIBDEVFS_DEV_NULL: 'y'
+    CONFIG_LIBDEVFS_DEV_STDOUT: 'y'
+    CONFIG_LIBDEVFS_DEV_ZERO: 'y'
+    CONFIG_LIBDEVFS: 'y'
+    CONFIG_LIBPOSIX_ENVIRON_ENVP0: "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
+    CONFIG_LIBPOSIX_ENVIRON_ENVP1: "LD_LIBRARY_PATH=/usr/local/lib:/usr/lib:/lib"
+    CONFIG_LIBPOSIX_ENVIRON_ENVP2: "HOME=/"
+    CONFIG_LIBPOSIX_ENVIRON: 'y'
+    CONFIG_LIBPOSIX_ENVIRON_LIBPARAM: 'y'
+    CONFIG_LIBPOSIX_ENVIRON_LIBPARAM_MAXCOUNT: '64'
+    CONFIG_LIBPOSIX_EVENTFD: 'y'
+    CONFIG_LIBPOSIX_FDIO: 'y'
+    CONFIG_LIBPOSIX_FDTAB: 'y'
+    CONFIG_LIBPOSIX_FUTEX: 'y'
+    CONFIG_LIBPOSIX_MMAP: 'y'
+    CONFIG_LIBPOSIX_PIPE: 'y'
+    CONFIG_LIBPOSIX_POLL: 'y'
+    CONFIG_LIBPOSIX_PROCESS: 'y'
+    CONFIG_LIBPOSIX_PROCESS_MULTITHREADING: 'y'
+    CONFIG_LIBPOSIX_SOCKET: 'y'
+    CONFIG_LIBPOSIX_SYSINFO: 'y'
+    CONFIG_LIBPOSIX_TIME: 'y'
+    CONFIG_LIBPOSIX_TIMERFD: 'y'
+    CONFIG_LIBPOSIX_UNIXSOCKET: 'y'
+    CONFIG_LIBPOSIX_USER_GID: 0
+    CONFIG_LIBPOSIX_USER_GROUPNAME: "root"
+    CONFIG_LIBPOSIX_USER_UID: 0
+    CONFIG_LIBPOSIX_USER_USERNAME: "root"
+    CONFIG_LIBPOSIX_USER: 'y'
+    CONFIG_LIBRAMFS: 'y'
+    CONFIG_LIBSYSCALL_SHIM_HANDLER_ULTLS: 'y'
+    CONFIG_LIBSYSCALL_SHIM_HANDLER: 'y'
+    CONFIG_LIBSYSCALL_SHIM_LEGACY_VERBOSE: 'y'
+    CONFIG_LIBSYSCALL_SHIM: 'y'
+    CONFIG_LIBUKALLOCPOOL: 'y'
+    CONFIG_LIBUKBLKDEV_MAXNBQUEUES: '1'
+    CONFIG_LIBUKBLKDEV_DISPATCHERTHREADS: 'y'
+    CONFIG_LIBUKBLKDEV_SYNC_IO_BLOCKED_WAITING: 'y'
+    CONFIG_LIBUKBLKDEV: 'y'
+    CONFIG_LIBUKBOOT_BANNER_MINIMAL: 'y'
+    CONFIG_LIBUKBOOT_HEAP_BASE: '0x400000000'
+    CONFIG_LIBUKBOOT_MAINTHREAD: 'y'
+    CONFIG_LIBUKBOOT_SHUTDOWNREQ_HANDLER: 'y'
+    CONFIG_LIBUKCPIO: 'y'
+    CONFIG_LIBUKDEBUG_CRASH_SCREEN: 'y'
+    CONFIG_LIBUKDEBUG_ENABLE_ASSERT: 'y'
+    CONFIG_LIBUKDEBUG_PRINT_SRCNAME: 'n'
+    CONFIG_LIBUKDEBUG_PRINT_TIME: 'y'
+    CONFIG_LIBUKDEBUG_PRINTK_ERR: 'y'
+    CONFIG_LIBUKDEBUG_PRINTK: 'y'
+    CONFIG_LIBUKDEBUG: 'y'
+    CONFIG_LIBUKFALLOC: 'y'
+    CONFIG_LIBUKMPI: 'n'
+    CONFIG_LIBUKSIGNAL: 'y'
+    CONFIG_LIBUKRANDOM_DEVFS: 'y'
+    CONFIG_LIBUKRANDOM: 'y'
+    CONFIG_LIBUKRANDOM_GETRANDOM: 'y'
+    CONFIG_LIBUKVMEM_DEFAULT_BASE: '0x0000001000000000'
+    CONFIG_LIBUKVMEM_DEMAND_PAGE_IN_SIZE: 12
+    CONFIG_LIBUKVMEM_PAGEFAULT_HANDLER_PRIO: 4
+    CONFIG_LIBUKVMEM: 'y'
+    CONFIG_LIBVFSCORE_AUTOMOUNT_CI: 'y'
+    CONFIG_LIBVFSCORE_AUTOMOUNT_CI_EINITRD: 'y'
+    CONFIG_LIBVFSCORE_NONLARGEFILE: 'y'
+    CONFIG_LIBVFSCORE: 'y'
+    CONFIG_OPTIMIZE_DEADELIM: 'y'
+    CONFIG_OPTIMIZE_LTO: 'y'
+    CONFIG_PAGING: 'y'
+    CONFIG_STACK_SIZE_PAGE_ORDER: 4 # 128 * 4K = 512K
+    CONFIG_UKPLAT_MEMREGION_MAX_COUNT: 64
+    CONFIG_LIBUKNETDEV_EINFO_LIBPARAM: 'y'
+
+    # Debug options
+    # CONFIG_LIBUKDEBUG_PRINTD: 'y'
+    # CONFIG_LIBUKDEBUG_PRINTK_INFO: 'y'
+    # CONFIG_LIBSYSCALL_SHIM_STRACE: 'y'
+    # CONFIG_LIBSYSCALL_SHIM_DEBUG: 'y'
+
+libraries:
+  lwip:
+    source: https://github.com/unikraft/lib-lwip.git
+    version: staging
+    kconfig:
+      CONFIG_LWIP_TCP: 'y'
+      CONFIG_LWIP_UDP: 'y'
+      CONFIG_LWIP_RAW: 'y'
+      CONFIG_LWIP_WND_SCALE: 'y'
+      CONFIG_LWIP_TCP_KEEPALIVE: 'y'
+      CONFIG_LWIP_THREADS: 'y'
+      CONFIG_LWIP_HEAP: 'y'
+      CONFIG_LWIP_SOCKET: 'y'
+      CONFIG_LWIP_AUTOIFACE: 'y'
+      CONFIG_LWIP_NUM_TCPCON: 64
+      CONFIG_LWIP_NUM_TCPLISTENERS: 64
+      CONFIG_LWIP_ICMP: 'y'
+      CONFIG_LWIP_DHCP: 'y'
+      CONFIG_LWIP_DNS: 'n'
+  libelf:
+    source: https://github.com/unikraft/lib-libelf.git
+    version: staging
+
+targets:
+- qemu/x86_64

library/loki/2.9/README.md

@@ -0,0 +1,75 @@
+# Loki
+
+This directory contains the [Loki](https://grafana.com/oss/loki/) log aggregation system on Unikraft, in binary compatibility mode.
+It implements a Loki instance running on Unikraft.
+
+## Run and Use
+
+Use `kraft` to run the image and start a Unikraft instance:
+
+```bash
+kraft run --rm -M 2048M -p 3100:3100 --plat qemu --arch x86_64 unikraft.org/loki:2.9
+```
+
+If the `--plat` argument is left out, it defaults to `qemu`.
+If the `--arch` argument is left out, it defaults to your system's CPU architecture.
+
+Once executed, it will open port `3100` and wait for connections.
+To test it, you can use `curl`:
+
+```bash
+curl localhost:3100/ready
+```
+
+You should see "ready" response from Loki.
+
+## Push Logs
+
+To push logs to Loki, you can use the following curl command:
+
+```bash
+curl -v -H "Content-Type: application/json" -XPOST "http://localhost:3100/loki/api/v1/push" --data-raw \
+  '{"streams": [{ "stream": { "foo": "bar2" }, "values": [ [ "1570818238000000000", "fizzbuzz" ] ] }]}'
+```
+
+## Query Logs
+
+To query logs from Loki:
+
+```bash
+curl -G -s "http://localhost:3100/loki/api/v1/query" --data-urlencode 'query={foo="bar2"}' | jq
+```
+
+## Inspect and Close
+
+To list information about the Unikraft instance, use:
+
+```bash
+kraft ps
+```
+
+To close the Unikraft instance, close the `kraft` process (e.g., via `Ctrl+c`) or run:
+
+```bash
+kraft rm <instance_name>
+```
+
+## Build and Run Locally
+
+To build a local image, clone this repository and `cd` into this directory.
+Then use `kraft` to build an image locally:
+
+```bash
+kraft build --no-cache --no-update --plat qemu --arch x86_64
+```
+
+In order to run the locally built image, use `.` as the final argument:
+
+```bash
+kraft run --rm -M 2048M -p 3100:3100 --plat qemu --arch x86_64 .
+```
+
+## Learn More
+
+- [How to run unikernels locally](https://unikraft.org/docs/cli/running)
+- [Loki Documentation](https://grafana.com/docs/loki/latest/)

library/loki/2.9/loki-local-config.yaml

@@ -0,0 +1,79 @@
+auth_enabled: false
+
+server:
+  http_listen_port: 3100
+  grpc_listen_port: 9096
+
+common:
+  instance_addr: 127.0.0.1
+  path_prefix: /tmp/loki
+  storage:
+    filesystem:
+      chunks_directory: /tmp/loki/chunks
+      rules_directory: /tmp/loki/rules
+  replication_factor: 1
+  ring:
+    instance_addr: 127.0.0.1
+    kvstore:
+      store: inmemory
+
+ingester:
+  lifecycler:
+    address: 127.0.0.1
+    ring:
+      kvstore:
+        store: inmemory
+      replication_factor: 1
+    final_sleep: 0s
+  chunk_idle_period: 1h
+  max_chunk_age: 1h
+  chunk_target_size: 1048576
+  chunk_retain_period: 30s
+
+query_range:
+  results_cache:
+    cache:
+      embedded_cache:
+        enabled: true
+        max_size_mb: 100
+
+schema_config:
+  configs:
+    - from: 2020-10-24
+      store: boltdb-shipper
+      object_store: filesystem
+      schema: v11
+      index:
+        prefix: index_
+        period: 24h
+
+storage_config:
+  boltdb_shipper:
+    active_index_directory: /tmp/loki/boltdb-shipper-active
+    cache_location: /tmp/loki/boltdb-shipper-cache
+    shared_store: filesystem
+  filesystem:
+    directory: /tmp/loki/chunks
+
+limits_config:
+  reject_old_samples: true
+  reject_old_samples_max_age: 168h
+
+chunk_store_config:
+  max_look_back_period: 0s
+
+table_manager:
+  retention_deletes_enabled: false
+  retention_period: 0s
+
+ruler:
+  storage:
+    type: local
+    local:
+      directory: /tmp/loki/rules
+  rule_path: /tmp/loki/rules-temp
+  alertmanager_url: http://localhost:9093
+  ring:
+    kvstore:
+      store: inmemory
+  enable_api: true